{"id":44011,"date":"2021-01-07T17:32:14","date_gmt":"2021-01-07T12:02:14","guid":{"rendered":"https:\/\/cracku.in\/blog\/?p=44011"},"modified":"2021-01-07T17:32:14","modified_gmt":"2021-01-07T12:02:14","slug":"top-20-rrb-ntpc-number-systems-questions","status":"publish","type":"post","link":"https:\/\/cracku.in\/blog\/top-20-rrb-ntpc-number-systems-questions\/","title":{"rendered":"Top-20 RRB NTPC Number Systems Questions"},"content":{"rendered":"

RRB NTPC Number Systems Questions<\/strong><\/h1>\n

Download Top-20 Number Systems\u00a0 questions for RRB NTPC exam. Most important\u00a0 Number Systems\u00a0 questions based on asked questions in previous exam papers for RRB NTPC.<\/p>\n

Download Top-20 RRB NTPC Number Systems Questions <\/a><\/p>\n

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Question 1:\u00a0<\/b>Find the L.C.M. of 148 and 185<\/p>\n

a)\u00a0680<\/p>\n

b)\u00a0740<\/p>\n

c)\u00a02960<\/p>\n

d)\u00a03700<\/p>\n

Question 2:\u00a0<\/b>Which of the following is a prime number ?<\/p>\n

a)\u00a033<\/p>\n

b)\u00a087<\/p>\n

c)\u00a093<\/p>\n

d)\u00a097<\/p>\n

Question 3:\u00a0<\/b>The HCF and LCM of two numbers are 3 and 2730 respectively. If one of the numbers is 78, find the other number.<\/p>\n

a)\u00a0107<\/p>\n

b)\u00a0103<\/p>\n

c)\u00a0105<\/p>\n

d)\u00a0102<\/p>\n

Question 4:\u00a0<\/b>Find the LCM of 15, 25 and 29.<\/p>\n

a)\u00a02335<\/p>\n

b)\u00a03337<\/p>\n

c)\u00a02175<\/p>\n

d)\u00a02375<\/p>\n

Question 5:\u00a0<\/b>If R019 is divisible by 11, find the value of the smallest natural number R?<\/p>\n

a)\u00a05<\/p>\n

b)\u00a06<\/p>\n

c)\u00a07<\/p>\n

d)\u00a08<\/p>\n

Question 6:\u00a0<\/b>Find the LCM of 25\/7, 15\/28, 20\/21.<\/p>\n

a)\u00a0300\/7<\/p>\n

b)\u00a0300<\/p>\n

c)\u00a0320\/23<\/p>\n

d)\u00a0320<\/p>\n

Question 7:\u00a0<\/b>The LCM of two numbers is 210. If their HCF is 35 and one of the numbers is 105, find the other number.<\/p>\n

a)\u00a035<\/p>\n

b)\u00a070<\/p>\n

c)\u00a0105<\/p>\n

d)\u00a0140<\/p>\n

Question 8:\u00a0<\/b>If P713 is divisible by 11, find the value of the smallest natural number P?<\/p>\n

a)\u00a05<\/p>\n

b)\u00a06<\/p>\n

c)\u00a07<\/p>\n

d)\u00a09<\/p>\n

Question 9:\u00a0<\/b>The LCM and HCF of 2 numbers are 168 and 6 respectively. If one of the numbers is 24, find the other.<\/p>\n

a)\u00a036<\/p>\n

b)\u00a038<\/p>\n

c)\u00a040<\/p>\n

d)\u00a042<\/p>\n

Question 10:\u00a0<\/b>If x is an even number, what is the consecutive odd number?<\/p>\n

a)\u00a0x-1<\/p>\n

b)\u00a0x+1<\/p>\n

c)\u00a0x+2<\/p>\n

d)\u00a0x-2<\/p>\n

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Question 11:\u00a0<\/b>The HCF of two numbers is 4 and the two other factors of LCM are 5 and 7. Find the smaller of the two numbers.<\/p>\n

a)\u00a010<\/p>\n

b)\u00a014<\/p>\n

c)\u00a020<\/p>\n

d)\u00a028<\/p>\n

Question 12:\u00a0<\/b>The HCF of two numbers is 6 and their LCM is 108. If one of the numbers is 12, then the other is<\/p>\n

a)\u00a027<\/p>\n

b)\u00a054<\/p>\n

c)\u00a048<\/p>\n

d)\u00a036<\/p>\n

Question 13:\u00a0<\/b>What number should be deducted from 1265 to make it divisible by 29 exactly?<\/p>\n

a)\u00a015<\/p>\n

b)\u00a016<\/p>\n

c)\u00a018<\/p>\n

d)\u00a017<\/p>\n

Question 14:\u00a0<\/b>Find the least number required to be added to 3105 so that it is exactly divisible by 3, 4, 5 and 6.<\/p>\n

a)\u00a095<\/p>\n

b)\u00a012<\/p>\n

c)\u00a011<\/p>\n

d)\u00a015<\/p>\n

Question 15:\u00a0<\/b>The ratio of two numbers is 4 : 3 and their HCF is 8. Find their LCM.<\/p>\n

a)\u00a048<\/p>\n

b)\u00a096<\/p>\n

c)\u00a064<\/p>\n

d)\u00a084<\/p>\n

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Question 16:\u00a0<\/b>Find the largest number of three digits exactly divisible by 15, 18, 27 and 30.<\/p>\n

a)\u00a0870<\/p>\n

b)\u00a0900<\/p>\n

c)\u00a0810<\/p>\n

d)\u00a0780<\/p>\n

Question 17:\u00a0<\/b>Find the LCM of the following fractions: 2\/3 , 8\/9 , 16\/27, 32\/81<\/p>\n

a)\u00a032\/81<\/p>\n

b)\u00a081\/32<\/p>\n

c)\u00a032\/3<\/p>\n

d)\u00a011\/41<\/p>\n

Question 18:\u00a0<\/b>Sita starts to calculate sum of all odd natural numbersi less than 72. What result does she get’?<\/p>\n

a)\u00a01196<\/p>\n

b)\u00a01296<\/p>\n

c)\u00a01331<\/p>\n

d)\u00a01276<\/p>\n

Question 19:\u00a0<\/b>Find the LCM of 3.2, 2.72, 1.28 and 1.44<\/p>\n

a)\u00a024.48<\/p>\n

b)\u00a02448<\/p>\n

c)\u00a097.92<\/p>\n

d)\u00a0979.20<\/p>\n

Question 20:\u00a0<\/b>What is the minimum number to be subtracted from 6321, which makes it completely divisible by 14?<\/p>\n

a)\u00a08<\/p>\n

b)\u00a012<\/p>\n

c)\u00a07<\/p>\n

d)\u00a011<\/p>\n

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Answers & Solutions:<\/strong><\/span><\/p>\n

1)\u00a0Answer\u00a0(B)<\/strong><\/p>\n

$148 = 2^2 \\times 37$<\/p>\n

$185 = 5 \\times 37$<\/p>\n

LCM = $ 2^2 \\times 5 \\times\u00a037$ = 740<\/p>\n

So , the answer would be option b)740<\/p>\n

2)\u00a0Answer\u00a0(D)<\/strong><\/p>\n

From the given options, It can be observed that 97 is a prime number as other three numbers have factors other 1 & itself for them.<\/p>\n

3)\u00a0Answer\u00a0(C)<\/strong><\/p>\n

$ HCF \\times LCM = Product of two numbers$<\/p>\n

Second number = $\\frac{2730 \\times 3}{78}$ = 105<\/p>\n

So , the answer would be option c)105.<\/p>\n

4)\u00a0Answer\u00a0(C)<\/strong><\/p>\n

15 = 3 $\\times$ 5<\/p>\n

25 =\u00a05\u00a0$\\times$ 5<\/p>\n

29 is a prime number.<\/p>\n

LCM = 3\u00a0$\\times 5\u00a0\\times 5 \\times 29 $ =2175<\/p>\n

So, the answer would be option c)2175<\/p>\n

5)\u00a0Answer\u00a0(D)<\/strong><\/p>\n

Divisibility rule of 11 is:<\/p>\n

sum of digits in odd place should be equal to sum of digits in even place or their differences should be divisible by 11.<\/p>\n

here, $R+1=0+9=9$.<\/p>\n

So, the smallest digit should be 8 .<\/p>\n

So,$R= 8$.<\/p>\n

D is correct choice.<\/p>\n

6)\u00a0Answer\u00a0(A)<\/strong><\/p>\n

LCM of a fraction means<\/p>\n

(LCM of numerator\/HCF of denominatior).<\/span><\/p>\n

here,\u00a0<\/span><\/p>\n

$25=5^2,15=5\u00d73,20=5\u00d72^2$
\n<\/span><\/p>\n

and $21=3\u00d77,28=7\u00d72^2$
\n<\/span><\/p>\n

So,LCM(25,15,20)=$5\u00d73\u00d72^2=300$
\n<\/span><\/p>\n

and
\n<\/span><\/p>\n

HCF(7,21,28)=7.
\n<\/span><\/p>\n

So, required LCM=(300\/7).
\n<\/span><\/p>\n

A is correct choice.
\n<\/span><\/p>\n

7)\u00a0Answer\u00a0(B)<\/strong><\/p>\n

We know that multiplication of two numbers is equal to the multiplication of their LCM and HCF.<\/p>\n

Here,LCM=210 and HCF=35 .<\/p>\n

Let say ,another number is x.<\/p>\n

So,$210\u00d735=105 \u00d7 x$<\/p>\n

or,$x=(210\u00d735)\/105=70$<\/p>\n

So, another number is 70.<\/p>\n

B is correct choice.<\/p>\n

8)\u00a0Answer\u00a0(D)<\/strong><\/p>\n

Divisibility rule of 11 :<\/p>\n

sum of digits in odd place should be equal to sum of digits in even place or their difference should be a multiple of 11.<\/p>\n

here ,sum of digits in odd place is(P+1)<\/p>\n

and sum of digits in even place is 3+7=10.<\/p>\n

So, P would get minimum value only when<\/p>\n

P+1=10 or, P=9.<\/p>\n

D is correct choice.<\/p>\n

9)\u00a0Answer\u00a0(D)<\/strong><\/p>\n

$multiplication\\ of\\ two\\ numbers=LCM\\times HCF\\ of\\ these\\ two\\ numbers.$<\/p>\n

here, LCM=168 and HCF=6 and one of the number is 24.<\/p>\n

So,$other\\ number\\times24=168\\times6.$<\/p>\n

or,$other\\ number=\\frac{\\left(168\\times6\\right)}{24}=42.$<\/p>\n

So,D is correct choice.<\/p>\n

10)\u00a0Answer\u00a0(B)<\/strong><\/p>\n

Let say,x=2, which is an even number.<\/p>\n

So,next odd number is 3.<\/p>\n

So, consecutive odd number appears in(x+1) form.<\/p>\n

B is correct choice.<\/p>\n

Free RRB Preparation Videos<\/a><\/p>\n

11)\u00a0Answer\u00a0(C)<\/strong><\/p>\n

Given that the H.C.F. of two numbers is 4 and the other two factors of the L.C.M are 5 and 7.<\/p>\n

We are to find the smaller of the two numbers.<\/p>\n

Let a and b be the two numbers where a < b.<\/p>\n

Since the L.C.M. has three factors 4, 5 and 7 and H.C.F. of a and b is 4.<\/p>\n

So, 4 is a factor of both the numbers a and b.<\/p>\n

Also, 5 is a factor of one number and 7 is a factor of the other number.<\/p>\n

The two numbers will be 5*4 and 7*4.<\/p>\n

Thus, the two numbers are 20 and 28., and so the smaller number is 20.<\/p>\n

12)\u00a0Answer\u00a0(B)<\/strong><\/p>\n

let the other numberbe x<\/p>\n

As we know that<\/p>\n

$lcm\\times hcf$ = product of two numbers<\/p>\n

$108\\times 6$ = $12\\times x$<\/p>\n

x = 54<\/p>\n

13)\u00a0Answer\u00a0(C)<\/strong><\/p>\n

Add three times the last digit to the remaining leading truncated number. If the result is divisible by 29, then so was the first number. Apply this rule over and over again as necessary.<\/p>\n

$1265 ….126+(5+5+5)= 141$<\/p>\n

$141 ….14 + (1+1+1) =17(here we not get 29\u00a0)$<\/p>\n

so we deduct\u00a018 and try<\/p>\n

$1265 – 18 =1247 …..124+(7+7+7) =145$<\/p>\n

$145 ….14 + (5+5+ 5) = 29$<\/p>\n

so, 18 is the number<\/p>\n

14)\u00a0Answer\u00a0(D)<\/strong><\/p>\n

$LCM of 3, 4, 5 and 6 = 2\\times 3\\times\u00a0 2\\times 5\\times 1\\times 1 = 60$<\/p>\n

On dividing 60 with 3105, we get remainder 45<\/p>\n

\u2234 Number to be added = 60 – 45 = 15<\/p>\n

15)\u00a0Answer\u00a0(B)<\/strong><\/p>\n

Let the number be 3x and 4x<\/p>\n

LCM*HCF=product of two numbers<\/p>\n

8*LCM=3x*4x<\/p>\n

LCM=$\\frac{12x^2}{8}$<\/p>\n

LCM=$\\frac{3x^2}{2}$<\/p>\n

LCM of 3x and 4x=12x<\/p>\n

12x=$\\frac{3x^2}{2}$<\/p>\n

x=8<\/p>\n

the number be $3\\times 8$ and $4\\times 8$ = 24,32<\/p>\n

LCM=(24,32) = 96<\/span><\/p>\n

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16)\u00a0Answer\u00a0(C)<\/strong><\/p>\n

we have to find lcm of the numbers<\/p>\n

15 = $3\\times 5$<\/p>\n

18 = $2\\times 3\\times 3$<\/p>\n

27 =\u00a0 $3\\times 3\\times 3$<\/p>\n

30=\u00a0$2\\times 3\\times 5$<\/p>\n

so, lcm =\u00a0$2\\times 3\\times 3\\times 3\\times 5$<\/p>\n

= 270<\/p>\n

so, 810 is the only number divisible by 270<\/p>\n

17)\u00a0Answer\u00a0(C)<\/strong><\/p>\n

LCM of fractions is LCM of the numerators divided by HCF of denominators.<\/p>\n

LCM (2, 8, 16, 32) = 32<\/p>\n

HCF (3, 9, 27, 81) = 3<\/p>\n

So LCM (2\/3, 8\/9, 32\/81) = 32\/3<\/p>\n

18)\u00a0Answer\u00a0(B)<\/strong><\/p>\n

Odd natural numbers less than 72 = 1, 3, 5, 7, 9…….71<\/p>\n

Here, a = 1 and common difference = 2<\/p>\n

Number of terms = n<\/p>\n

And nth term is 71.<\/p>\n

So,<\/p>\n

71= a + (n – 1)d<\/p>\n

\u21d2 71 = 1 + (n – 1)2<\/p>\n

\u21d2 71 – 1 = 2n – 2<\/p>\n

\u21d2 70 + 2 = 2n<\/p>\n

\u21d2 n = 72\/2<\/p>\n

\u21d2 n = 36<\/p>\n

Now, sum of n number of terms = Sn = n\/2{2a +(n – 1)d}<\/p>\n

$S_{36} = 36\/2 \\times ({{2 \\times1 + (36 -1)2}})$<\/p>\n

$= 18 \\times ({2 + (35\\times2)})$<\/p>\n

$= 18\\times72$<\/p>\n

1296<\/p>\n

19)\u00a0Answer\u00a0(D)<\/strong><\/p>\n

To solve this type of problems we have to follow the below steps.<\/p>\n

Step I:<\/strong> Convert each of the decimals to like decimals.<\/p>\n

Step II:<\/strong> Remove the decimal point and find the least common multiple (LCM) as usual.<\/p>\n

Step III:<\/strong> In the LCM, put the decimal point as there are a number of decimal places in the like decimals.<\/p>\n

LCM of 3.2, 2.72, 1.28 and 1.44<\/p>\n

Step I: <\/strong>Like decimals are 3.2, 2.72, 1.28 and 1.44<\/p>\n

Step II: <\/strong>LCM of 32\/10, 272\/100, 128\/100 and 144\/100 = LCM(32, 272, 128, 144) = 97920<\/p>\n

Step III: <\/strong>LCM of 3.2, 2.72, 1.28, 1.44 = 979.20<\/p>\n

\u2234 LCM of 3.2, 2.72, 1.28, 1.44 = 979.20<\/p>\n

20)\u00a0Answer\u00a0(C)<\/strong><\/p>\n

A number is divisible by 14 only when it is divisible by both the factor of 14 i.e 7 and 2<\/p>\n

we know a number is divisible by 2 when the last digit of the number is even<\/p>\n

we also know that a number is divisible by 7 when the double of last two digits of the number, when subtracted by the remaining number gives 0 or different multiple of 7<\/p>\n

so if we subtract 7 from the number we get an even number and a number divisible by 7 hence making the number divisible by 14<\/p>\n

<\/figure>\n

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Download RRB Preparation App<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

RRB NTPC Number Systems Questions Download Top-20 Number Systems\u00a0 questions for RRB NTPC exam. Most important\u00a0 Number Systems\u00a0 questions based on asked questions in previous exam papers for RRB NTPC. Take a free RRB NTPC mock test Download RRB NTPC Previous Papers PDF Question 1:\u00a0Find the L.C.M. of 148 and 185 a)\u00a0680 b)\u00a0740 c)\u00a02960 d)\u00a03700 […]<\/p>\n","protected":false},"author":53,"featured_media":44013,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[3171,31,1603,1601],"tags":[1625,22,1593],"class_list":{"0":"post-44011","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-railways-en","8":"category-railways","9":"category-rrb-ntpc","10":"category-rrb-ntpc-je","11":"tag-maths","12":"tag-number-systems","13":"tag-rrb-ntpc"},"better_featured_image":{"id":44013,"alt_text":"Top 20 RRB NTPC Number Systems Questions","caption":"Top-20 RRB NTPC Number Systems Questions ","description":"Top-20 RRB NTPC Number Systems Questions 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