{"id":26195,"date":"2019-03-18T17:56:13","date_gmt":"2019-03-18T12:26:13","guid":{"rendered":"https:\/\/cracku.in\/blog\/?p=26195"},"modified":"2019-03-29T10:09:04","modified_gmt":"2019-03-29T04:39:04","slug":"rrb-ntpc-lcm-hcf-questions-pdf","status":"publish","type":"post","link":"https:\/\/cracku.in\/blog\/rrb-ntpc-lcm-hcf-questions-pdf\/","title":{"rendered":"RRB  NTPC LCM &#038; HCF Questions PDF"},"content":{"rendered":"<h1><span style=\"text-decoration: underline;\">RRB NTPC LCM &amp; HCF Questions PDF<\/span><\/h1>\n<p>Download RRB NTPC LCM &amp; HCF Questions and Answers PDF. Top 25 RRB NTPC\u00a0 Maths\u00a0 questions based on asked questions in previous exam papers very important for the Railway NTPC exam.<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/downloads\/3702\" target=\"_blank\" class=\"btn btn-danger  download\">Download RRB NTPC LCM &amp; HCF Questions PDF<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/pay\/5oeW1\" target=\"_blank\" class=\"btn btn-info \">20 RRB NTPC Mocks &#8211; Just Rs. 149<\/a><\/p>\n<p><p class=\"text-center\"><a href=\"https:\/\/cracku.in\/railways-ntpc-previous-papers\" target=\"_blank\" class=\"btn btn-primary \">RRB NTPC Previous Papers [Download PDF]<\/a><\/p><a href=\"https:\/\/cracku.in\/pay\/5sUuA\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-25703 size-full\" src=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png\" alt=\"RRB NTPC Mock Test\" width=\"728\" height=\"90\" srcset=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png 728w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-300x37.png 300w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-30x4.png 30w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-696x86.png 696w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p><b>Question 1:\u00a0<\/b>If the LCM and HCF of two numbers are 72 and 12 respectively. Find the second number if one number is 36 ?<\/p>\n<p>a)\u00a024<\/p>\n<p>b)\u00a048<\/p>\n<p>c)\u00a012<\/p>\n<p>d)\u00a060<\/p>\n<p><b>Question 2:\u00a0<\/b>Find the HCF of two numbers if LCM and product of those two numbers are 45 and 675 respectively ?<\/p>\n<p>a)\u00a025<\/p>\n<p>b)\u00a020<\/p>\n<p>c)\u00a015<\/p>\n<p>d)\u00a035<\/p>\n<p><b>Question 3:\u00a0<\/b>Find the LCM and HCF of 196 and 392 ?<\/p>\n<p>a)\u00a0196 &amp; 392<\/p>\n<p>b)\u00a0392 &amp; 196<\/p>\n<p>c)\u00a0392 &amp; 14<\/p>\n<p>d)\u00a014 &amp; 392<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/www.youtube.com\/channel\/UCMDJPaiDdRPv2mrEJoLfklA?sub_confirmation=1\" target=\"_blank\" class=\"btn btn-warning \">FREE RRB NTPC YOUTUBE VIDEOS<\/a><\/p>\n<p><p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-ntpc-mock-test\" target=\"_blank\" class=\"btn btn-danger \">RRB NTPC Free Mock Test<\/a><\/p><a href=\"https:\/\/cracku.in\/pay\/5sUuA\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-25703 size-full\" src=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png\" alt=\"RRB NTPC Mock Test\" width=\"728\" height=\"90\" srcset=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png 728w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-300x37.png 300w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-30x4.png 30w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-696x86.png 696w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p><b>Question 4:\u00a0<\/b>Find LCM of 2\/3 , 3\/6, 4\/12 ?<\/p>\n<p>a)\u00a04<\/p>\n<p>b)\u00a02<\/p>\n<p>c)\u00a03<\/p>\n<p>d)\u00a06<\/p>\n<p><b>Question 5:\u00a0<\/b>Two numbers have their HCF as 9 and they are in the ratio 3:4 find their LCM ?<\/p>\n<p>a)\u00a072<\/p>\n<p>b)\u00a036<\/p>\n<p>c)\u00a0108<\/p>\n<p>d)\u00a090<\/p>\n<p><b>Question 6:\u00a0<\/b>Find the LCM of 7\/2, 9\/4 and 5\/3 ?<\/p>\n<p>a)\u00a0252<\/p>\n<p>b)\u00a021<\/p>\n<p>c)\u00a0126<\/p>\n<p>d)\u00a0315<\/p>\n<p><b>Question 7:\u00a0<\/b>What is the difference between the LCM and HCF of 24, 48 ?<\/p>\n<p>a)\u00a012<\/p>\n<p>b)\u00a023<\/p>\n<p>c)\u00a054<\/p>\n<p>d)\u00a024<\/p>\n<p><b>Question 8:\u00a0<\/b>Find the HCF of two numbers whose LCM is 38 and product of those two numbers is 266 ?<\/p>\n<p>a)\u00a04<\/p>\n<p>b)\u00a05<\/p>\n<p>c)\u00a06<\/p>\n<p>d)\u00a07<\/p>\n<p><b>Question 9:\u00a0<\/b>Find LCM of two numbers, whose product is 864 and HCF is 12 ?<\/p>\n<p>a)\u00a072<\/p>\n<p>b)\u00a060<\/p>\n<p>c)\u00a036<\/p>\n<p>d)\u00a024<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/railways-ntpc-previous-papers\" target=\"_blank\" class=\"btn btn-alone \">RRB NTPC Previous Papers Download PDF<\/a><\/p>\n<p><p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-je-previous-papers\" target=\"_blank\" class=\"btn btn-primary \">RRB JE PREVIOUS PAPERS DOWNLOAD<\/a><\/p><a href=\"https:\/\/cracku.in\/pay\/5sUuA\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-25703 size-full\" src=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png\" alt=\"RRB NTPC Mock Test\" width=\"728\" height=\"90\" srcset=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png 728w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-300x37.png 300w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-30x4.png 30w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-696x86.png 696w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p><b>Question 10:\u00a0<\/b>Find the HCF of 12, 24, 36, 30 ?<\/p>\n<p>a)\u00a018<\/p>\n<p>b)\u00a012<\/p>\n<p>c)\u00a06<\/p>\n<p>d)\u00a024<\/p>\n<p><b>Question 11:\u00a0<\/b>Find the product of LCM and HCF of 48 and 72 ?<\/p>\n<p>a)\u00a0432<\/p>\n<p>b)\u00a0864<\/p>\n<p>c)\u00a01728<\/p>\n<p>d)\u00a03456<\/p>\n<p><b>Question 12:\u00a0<\/b>Find the HCF of 3\/2, 4\/3, 5\/4 ?<\/p>\n<p>a)\u00a01\/12<\/p>\n<p>b)\u00a012<\/p>\n<p>c)\u00a01\/6<\/p>\n<p>d)\u00a06<\/p>\n<p><b>Question 13:\u00a0<\/b>If $x$ is a prime number, what is the LCM of $x^{18}, x^{24}$ and $x^{36}$<\/p>\n<p>a)\u00a0$x^{72}$<\/p>\n<p>b)\u00a0$x^{36}$<\/p>\n<p>c)\u00a0$x^{48}$<\/p>\n<p>d)\u00a0$x^{96}$<\/p>\n<p><b>Question 14:\u00a0<\/b>Find the least common multiple of the numbers 36, 72 and 108.<\/p>\n<p>a)\u00a0216<\/p>\n<p>b)\u00a0108<\/p>\n<p>c)\u00a0186<\/p>\n<p>d)\u00a0None of the above<\/p>\n<p><b>Question 15:\u00a0<\/b>The HCF and LCM of two numbers are 3 and 150. If the sum of the numbers is 81, what is the sum of the reciprocals of the numbers?<\/p>\n<p>a)\u00a02\/25<\/p>\n<p>b)\u00a09\/50<\/p>\n<p>c)\u00a03\/25<\/p>\n<p>d)\u00a07\/150<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/blog\/general-knowledge-questions-and-answers-for-competitive-exams-pdf\/\" target=\"_blank\" class=\"btn btn-alone \">18000+ Questions &#8211; Free SSC Study Material<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/blog\/general-science-questions-answers-competitive-exams-pdf-mcq-quiz\/\" target=\"_blank\" class=\"btn btn-info \">Download General Science Notes PDF<\/a><\/p>\n<p><b>Question 16:\u00a0<\/b>The LCM of two numbers is 105. The numbers are in the ratio 7:5. What is the sum of the two numbers?<\/p>\n<p>a)\u00a036<\/p>\n<p>b)\u00a021<\/p>\n<p>c)\u00a015<\/p>\n<p>d)\u00a045<\/p>\n<p><b>Question 17:\u00a0<\/b>What is the HCF of the fractions: \u00bd, 5\/7, 8\/11, \u00be ?<\/p>\n<p>a)\u00a02\/121<\/p>\n<p>b)\u00a01\/154<\/p>\n<p>c)\u00a01\/121<\/p>\n<p>d)\u00a01\/308<\/p>\n<p><b>Question 18:\u00a0<\/b>The least number n, where n&gt;4, which when divided by 9, 11 and 12 leaves a remainder 4 is<\/p>\n<p>a)\u00a0396<\/p>\n<p>b)\u00a0400<\/p>\n<p>c)\u00a0796<\/p>\n<p>d)\u00a0None of the above<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-ntpc-mock-test\" target=\"_blank\" class=\"btn btn-primary \">RRB NTPC Free Mock Test<\/a><\/p>\n<p><p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-je-mock-test\" target=\"_blank\" class=\"btn btn-info \">RRB JE Free Mock Test<\/a><\/p><a href=\"https:\/\/cracku.in\/pay\/5sUuA\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-25703 size-full\" src=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png\" alt=\"RRB NTPC Mock Test\" width=\"728\" height=\"90\" srcset=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png 728w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-300x37.png 300w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-30x4.png 30w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-696x86.png 696w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p><b>Question 19:\u00a0<\/b>The product of HCF and LCM of two numbers is 525. If one of the numbers is 21, what is the other number?<\/p>\n<p>a)\u00a025<\/p>\n<p>b)\u00a030<\/p>\n<p>c)\u00a020<\/p>\n<p>d)\u00a0Cannot be determined<\/p>\n<p><b>Question 20:\u00a0<\/b>Three numbers are in the ratio 1 : 2 : 5. Their LCM is 1600. What is the HCF of the three numbers?<\/p>\n<p>a)\u00a0400<\/p>\n<p>b)\u00a0800<\/p>\n<p>c)\u00a0320<\/p>\n<p>d)\u00a0160<\/p>\n<p><b>Question 21:\u00a0<\/b>The greatest 3 digit number that is divisible by 20, 30, 50 and 60 is<\/p>\n<p>a)\u00a0990<\/p>\n<p>b)\u00a0900<\/p>\n<p>c)\u00a0800<\/p>\n<p>d)\u00a0750<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-online-test\" target=\"_blank\" class=\"btn btn-primary \"> Daily Free RRB Online Tests for RRB Exams<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/free-gk-tests\" target=\"_blank\" class=\"btn btn-info \">100+ Free Online G.K Tests<\/a><\/p>\n<p><b>Question 22:\u00a0<\/b>The HCF of two numbers is 13 and the other two factors of their LCM are 5 and 9. What is the larger of the two numbers?<\/p>\n<p>a)\u00a045<\/p>\n<p>b)\u00a065<\/p>\n<p>c)\u00a0117<\/p>\n<p>d)\u00a0585<\/p>\n<p><b>Question 23:\u00a0<\/b>HCF and LCM of two numbers are 11 and 825 respectively. If one number is 275 find the other number.<\/p>\n<p>a)\u00a053<\/p>\n<p>b)\u00a045<\/p>\n<p>c)\u00a033<\/p>\n<p>d)\u00a043<\/p>\n<p><b>Question 24:\u00a0<\/b>Product of two coprime numbers is 117. Then their LCM is<\/p>\n<p>a)\u00a09<\/p>\n<p>b)\u00a013<\/p>\n<p>c)\u00a039<\/p>\n<p>d)\u00a0117<\/p>\n<p><b>Question 25:\u00a0<\/b>Two numbers are in the ratio 3:4. Their L.C.M. is 84. The greater number is<\/p>\n<p>a)\u00a021<\/p>\n<p>b)\u00a024<\/p>\n<p>c)\u00a028<\/p>\n<p>d)\u00a084<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-ntpc-mock-test\" target=\"_blank\" class=\"btn btn-info \">Free RRB Daily Practice Set<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/rrb-je-previous-papers\" target=\"_blank\" class=\"btn btn-warning \">Download Current Affairs Questions &amp; Answers PDF<\/a><\/p>\n<p><a href=\"https:\/\/cracku.in\/pay\/5sUuA\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-25703 size-full\" src=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png\" alt=\"RRB NTPC Mock Test\" width=\"728\" height=\"90\" srcset=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png 728w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-300x37.png 300w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-30x4.png 30w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-696x86.png 696w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Answers &amp; Solutions:<\/strong><\/span><\/p>\n<p><strong>1)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>Let x be the second number,<\/p>\n<p>LCM*HCF = Product of two numbers<\/p>\n<p>72*12 = 36*x<\/p>\n<p>x = 24<\/p>\n<p>So the answer is option A.<\/p>\n<p><strong>2)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>LCM*HCF = 675<\/p>\n<p>(45)*HCF = 675<\/p>\n<p>HCF = 675\/45 = 15<\/p>\n<p>So the answer is option C.<\/p>\n<p><strong>3)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>Here 392 = 2*196, Hence LCM is 392 and HCF is 196<\/p>\n<p>So the answer is option B.<\/p>\n<p><strong>4)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>2\/3 , 3\/6, 4\/12 = 2\/3 , 1\/2 , 1\/3<\/p>\n<p>LCM of fractions = (LCM of numerators)\/(HCF of denominators) = (LCM of 2, 1, 1)\/(HCF of 3,2,3) = 2\/1 = 2<\/p>\n<p>So the answer is option B.<\/p>\n<p><strong>5)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Two numbers have their HCF as 9 and they are in the ratio 3:4<\/p>\n<p>Those numbers are 3*9=27 and 4*9=36<\/p>\n<p>LCM of 27 and 36 is 108.<\/p>\n<p>So the answer is option C.<\/p>\n<p><strong>6)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>LCM of fractions = LCM of numerators\/HCF of denominators<\/p>\n<p>LCM of 7\/2, 9\/4 and 5\/3 = (LCM of 7,9,5)\/(HCF of 2,4,3) = 315\/1 = 315<\/p>\n<p>So the answer is option A.<\/p>\n<p><strong>7)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>LCM of 24 and 48 = 48<\/p>\n<p>HCF of 24 and 48 = 24<\/p>\n<p>Difference = 24<\/p>\n<p>So the answer is option D.<\/p>\n<p><strong>8)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>LCM*HCF = product of two numbers<\/p>\n<p>(38)*HCF = 266<\/p>\n<p>HCF = 7<\/p>\n<p>So the answer is option D.<\/p>\n<p><strong>9)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>LCM*HCF = Product of numbers<\/p>\n<p>LCM*12 = 864<\/p>\n<p>LCM = 72<\/p>\n<p>So the answer is option A.<\/p>\n<p><a href=\"https:\/\/cracku.in\/pay\/5sUuA\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-25703 size-full\" src=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png\" alt=\"RRB NTPC Mock Test\" width=\"728\" height=\"90\" srcset=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png 728w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-300x37.png 300w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-30x4.png 30w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-696x86.png 696w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p><strong>10)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>12 = 2*2*3<\/p>\n<p>24 = 2*2*2*3<\/p>\n<p>36 = 2*2*3*3<\/p>\n<p>30 = 2*3*5<\/p>\n<p>HCF = product of common factors = 2*3 = 6<\/p>\n<p>So the answer is option C.<\/p>\n<p><strong>11)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>Product of LCM &amp; HCF of two numbers = product of those two numbers = 48*72 = 3456<\/p>\n<p>So the answer is option D.<\/p>\n<p><strong>12)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>HCF of fractions = (HCF of numerators)\/(LCM of denominators) = (HCF of 3,4,5)\/(LCM of 2,3,4) = 1\/12<\/p>\n<p>So the answer is option A.<\/p>\n<p><strong>13)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>It is important to note that $x{36} = x^{24} \\times x^{12}$.<br \/>\nTherefore, $x^{36}$ divides $x^{24}$<br \/>\nSimilarly, $x^{36}$ divides $x^{18}$<br \/>\nHence, $x^{36}$ divides both $x^{24}$ and $x^{18}$<br \/>\nTherefore, the LCM of $x^{18}, x^{24}$ and $x^{36}$ is $x^{36}$<\/p>\n<p><strong>14)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>$36 = 2^2 * 3^2$<br \/>\n$72 = 2^3 * 3^2$<br \/>\n$108 = 2^2 * 3^3$<br \/>\nSo, the LCM of the three numbers is $2^3 * 3^3$ = 8 * 27 = 216<\/p>\n<p><strong>15)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>Let the numbers be x and 81-x.<br \/>\nLCM * HCF = 450 = x*(81-x)<br \/>\n=&gt; $x^2 &#8211; 81x + 450 = 0$<br \/>\nSo, x = 6 or 75<\/p>\n<p>So, the sum of the reciprocals of the two numbers is 1\/6 + 1\/75 = (25+2)\/150 = 27\/150 = 9\/50<\/p>\n<p><strong>16)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>Let the two numbers be 7k and 5k.<br \/>\nLCM of 7 and 5 is 35. So, the LCM of the two numbers is 35k.<br \/>\n35k = 105 =&gt; k = 3<br \/>\nSo, the two numbers are 7*3 = 21 and 5*3 = 15<br \/>\nThe sum of the two numbers is 21+15 = 36<\/p>\n<p><strong>17)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>The HCF of fractions is equal to HCF of numerators\/LCM of denominators.<br \/>\nHCF of numerators = HCF of 1, 5, 8 and 3 = 1<br \/>\nLCM of numerators = LCM of 2, 7, 11 and 4 = 7*11*4 = 308<br \/>\nSo, the HCF of the fractions is 1\/308<\/p>\n<p><strong>18)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>$9 = 3^2$<br \/>\n$12 = 3 * 2^2$<br \/>\nSo, the LCM of 9, 11 and 12 is $3^2 * 2^2 * 11$ = 9 * 4 * 11 = 396<br \/>\nSo, the required number should be of the form 396k + 4<br \/>\nFor k = 1, the number becomes 396 + 4 = 400<\/p>\n<p><strong>19)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>From the properties of LCM and HCF, we have:<br \/>\nProduct of the two numbers = Product of HCF and LCM<br \/>\n21 * x = 525<br \/>\nSo, the other number is 525\/21 = 25<\/p>\n<p><strong>20)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>Let the numbers be k, 2k and 5k. The LCM of 1, 2 and 5 is 10. So, the LCM of k, 2k and 5k is 10k.<br \/>\n10k = 1600 =&gt; k = 160<br \/>\nSo, the three numbers are 160, 320 and 800. The HCF of the three numbers is 160.<\/p>\n<p><strong>21)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>The LCM of 20, 30 and 60 is 60.<br \/>\nThe LCM of 50 and 60 is 300.<br \/>\nSo, the number should be of the form 300k.<br \/>\nFor k = 3, the number is 300*3 = 900. For k &gt; 3, the number will not be a 3-digit number. So, 900 is the answer.<\/p>\n<p><strong>22)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Let the two numbers be a*h and b*h, where \u2018h\u2019 is the HCF of the two numbers. The LCM of the two numbers is a*b*h.<br \/>\nSince the other two factors of the LCM are 5 and 9, the two numbers are 5*13 = 65 and 9*13 = 117<br \/>\nSo, the larger of the two numbers is 117<\/p>\n<p><strong>23)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Let the number = $x$<\/p>\n<p>HCF = 11 and LCM = 825<\/p>\n<p>Product of HCF and LCM = Product of the two numbers<\/p>\n<p>=&gt; $x \\times 275 = 11 \\times 825$<\/p>\n<p>=&gt; $x = \\frac{11 \\times 825}{275}$<\/p>\n<p>=&gt; $x = \\frac{825}{25} = 33$<\/p>\n<p>=&gt; Ans &#8211; (C)<\/p>\n<p>&nbsp;<\/p>\n<p><strong>24)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>Let the two numbers be a,b.<br \/>\nHence a * b = L.C.M(a,b) * G.C.D(a,b)<br \/>\nIt is given that a,b are co-primes, implies G.C.D(a,b) = 1<br \/>\nHence from the above equation we get L.C.M(a,b) = a*b = 117<\/p>\n<p><strong>25)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Let the numbers be 3x, 4x<br \/>\nLCM of 3x and 4x is = 12x<br \/>\nSo the number 84 is divisible by 12<br \/>\n$\\frac{84}{12}$ = 7<br \/>\nThe numbers are 7&#215;3 = 21 , 7x 4 = 28<br \/>\nThe greatest number is 28<\/p>\n<p><a href=\"https:\/\/cracku.in\/pay\/5sUuA\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-25703 size-full\" src=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png\" alt=\"RRB NTPC Mock Test\" width=\"728\" height=\"90\" srcset=\"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test.png 728w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-300x37.png 300w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-30x4.png 30w, https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/RRB-NTPC-Mock-Test-696x86.png 696w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.cracku.app&amp;hl=en_US\" target=\"_blank\" class=\"btn btn-danger \">DOWNLOAD APP FOR RRB FREE MOCKS<\/a><\/p>\n<p>We hope this LCM &amp; HCF\u00a0 questions for RRB NTPC Exam will be highly useful for your preparation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>RRB NTPC LCM &amp; HCF Questions PDF Download RRB NTPC LCM &amp; HCF Questions and Answers PDF. Top 25 RRB NTPC\u00a0 Maths\u00a0 questions based on asked questions in previous exam papers very important for the Railway NTPC exam. Question 1:\u00a0If the LCM and HCF of two numbers are 72 and 12 respectively. Find the second [&hellip;]<\/p>\n","protected":false},"author":41,"featured_media":26196,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[169,125,31,1603,1601],"tags":[489,491,42,1619],"class_list":{"0":"post-26195","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-downloads","8":"category-featured","9":"category-railways","10":"category-rrb-ntpc","11":"category-rrb-ntpc-je","12":"tag-railway-exam","13":"tag-rrb","14":"tag-rrb-mock-test","15":"tag-rrb-ntpc-2019"},"better_featured_image":{"id":26196,"alt_text":"RRB NTPC LCM & HCF Questions Pdf","caption":"RRB NTPC LCM & HCF Questions Pdf","description":"RRB NTPC LCM & HCF Questions Pdf","media_type":"image","media_details":{"width":1200,"height":630,"file":"2019\/03\/fig-18-03-2019_12-15-09.jpg","sizes":{"thumbnail":{"file":"fig-18-03-2019_12-15-09-150x150.jpg","width":150,"height":150,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-150x150.jpg"},"medium":{"file":"fig-18-03-2019_12-15-09-300x158.jpg","width":300,"height":158,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-300x158.jpg"},"medium_large":{"file":"fig-18-03-2019_12-15-09-768x403.jpg","width":768,"height":403,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-768x403.jpg"},"large":{"file":"fig-18-03-2019_12-15-09-1024x538.jpg","width":1024,"height":538,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-1024x538.jpg"},"tiny-lazy":{"file":"fig-18-03-2019_12-15-09-30x16.jpg","width":30,"height":16,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-30x16.jpg"},"td_80x60":{"file":"fig-18-03-2019_12-15-09-80x60.jpg","width":80,"height":60,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-80x60.jpg"},"td_100x70":{"file":"fig-18-03-2019_12-15-09-100x70.jpg","width":100,"height":70,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-100x70.jpg"},"td_218x150":{"file":"fig-18-03-2019_12-15-09-218x150.jpg","width":218,"height":150,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-218x150.jpg"},"td_265x198":{"file":"fig-18-03-2019_12-15-09-265x198.jpg","width":265,"height":198,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-265x198.jpg"},"td_324x160":{"file":"fig-18-03-2019_12-15-09-324x160.jpg","width":324,"height":160,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-324x160.jpg"},"td_324x235":{"file":"fig-18-03-2019_12-15-09-324x235.jpg","width":324,"height":235,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-324x235.jpg"},"td_324x400":{"file":"fig-18-03-2019_12-15-09-324x400.jpg","width":324,"height":400,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-324x400.jpg"},"td_356x220":{"file":"fig-18-03-2019_12-15-09-356x220.jpg","width":356,"height":220,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-356x220.jpg"},"td_356x364":{"file":"fig-18-03-2019_12-15-09-356x364.jpg","width":356,"height":364,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-356x364.jpg"},"td_533x261":{"file":"fig-18-03-2019_12-15-09-533x261.jpg","width":533,"height":261,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-533x261.jpg"},"td_534x462":{"file":"fig-18-03-2019_12-15-09-534x462.jpg","width":534,"height":462,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-534x462.jpg"},"td_696x0":{"file":"fig-18-03-2019_12-15-09-696x365.jpg","width":696,"height":365,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-696x365.jpg"},"td_696x385":{"file":"fig-18-03-2019_12-15-09-696x385.jpg","width":696,"height":385,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-696x385.jpg"},"td_741x486":{"file":"fig-18-03-2019_12-15-09-741x486.jpg","width":741,"height":486,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-741x486.jpg"},"td_1068x580":{"file":"fig-18-03-2019_12-15-09-1068x580.jpg","width":1068,"height":580,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-1068x580.jpg"},"td_1068x0":{"file":"fig-18-03-2019_12-15-09-1068x561.jpg","width":1068,"height":561,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-1068x561.jpg"},"td_0x420":{"file":"fig-18-03-2019_12-15-09-800x420.jpg","width":800,"height":420,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2019\/03\/fig-18-03-2019_12-15-09-800x420.jpg"}},"image_meta":{"aperture":"0","credit":"","camera":"","ca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