Question

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 -

Answer 1

let the no.=x
x÷7/8=15/14+7x/8
8x/7=15/14+7x/8
8x/7 - 7x/8=15/14
(64x-49x)/56=15/14
15x/56=15/14
x=15/14*56/15
∴x=4
∴The no.=x=4