Question

15 is 30% of what number?

Answer 1

`15` is `30%` of `color(blue)(50`.

Explanation:

Let `x` represent the number.

`30%=0.3` in decimal form.

`0.3x=15`

Divide both sides by `0.3`.

`x=15/0.3`

`x=50`

Answer 2

50

Explanation:

First, we need to write this as an expression:

`0.3X=15`

The above states "30% of some number `X` is equal to 15"

Now, we can divide both sides by `X`'s coefficient to find our value:

`(cancel(0.3)X)/color(red)(cancel(0.3))=15/color(red)(0.3)`

`X=15/0.3=150/3`

`color(green)(x=50)`