Question

8 is what percent of 40?

Answer 1

`8` is `20%` of `40`.

Explanation:

When we say that something is `x` percent of `y`, we mean that it is `y xx x/100`. So, if we say that `8` is `x` percent of `40`, that means that `8 = 40 xx x/100`. Solving for `x`, we get

`8 = 40 xx x/100`

`=> 8 = (40x)/100`

`=> 8 xx 100/40 = (40x)/100 xx 100/40`

`=> 8 xx 5/2 = x`

`:. x = 20`

Thus `8` is `20` percent of `40`.