Question

72 is 18% of what number? A) 400 B)129.6 C)25

Answer 1

Number = x

`x * 18\% = 72`

So,

`18\% \\ = (18)/(100) \\ = 0.18`

Now,

`x * 0.18 = 72 \\ x = (72)/(0.18 ) \\ x = 400`

=> Option A) 400 is the correct answer.

Answer 2

Let the number = X

You would multiply x by the percent to equal 72:

X * 0.18 = 72

Divide both sides by 0.18

72 / 0.18 = 400

The answer is A)400