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I want to know formula

i am not able to learn the word problem or chapter question in quant section.what i should to be good in chapter questions in quant section?

121 81 49
100 64 36
15. 16. 25
? 31 41

in an examination,35% of total students failed in Hindi, 45% failed in English and 20% in both. find the percentage of those who passed in both the subjects.

520of 40%

350of 10%

suppose we take a date and a month, multiply the date with 12 (which is the number of months in a year) & the month with 31 (which is the number of days in a month) and add up the two products. suppose we are given that the sum is 555 and asked to find out the date and month.

radius of circle 14√2 cm PQRS IS A SQUARE AND KLMN,WXYZ,ABCD,EFGH ARE IDENTICAL SQUARE FIND THE VALUE OF SUM OF FOUR SMALL SQUARE

in mock test 4, question no 44. the length of square park including the pavement 20+2*2=24. is not it?

this meterial is nt in hindi