15 is 30% of what number?

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Answer 1 · 2018-06-08T00:17:19

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

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 · 2018-06-08T00:17:40

50

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:

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

$X=15/0.3=150/3$

$color(green)(x=50)$