Question

By what number should `(-5)/7` be divided so that the result is `(-15)/28`?

Answer 1

Consider the number as x

`(-5)/7 ÷ (-15)/28`

It can be written as

`(-5)/7 xx 1/x = (-15)/28`

By further calculation

`(-5)/(7x) = (-15)/28`

So we get

`x = 5/7 xx 28/15 = 4/3`

`x = 1 1/3`