A boy was asked to multiply a number by 7/8, instead he divided the number by 7/8 and got the result 15/14 more than what he should have got if he had multiplied the number by 7/8. The number is -

A 8

B 6

C 4

D None

Correct Answer: Option C

Solution: Let, the number be x

ATQ, x/7 - 7x/8 = 15/14 => 8x/7 - 7x/8 = 15/14

=> 64x - 49x/56 = 15/14 => 15x = 60 [ উভয়পক্ষকে 14 দ্বারা গুণ করে পাই ] x = 4