#1**+1 **

12 is 15% of what number?

Let the number =N, then:

15%N = 12

0.15N = 12 divide both sides by 0.15

N =12 / 0.15

**N = 80**

Guest May 22, 2017

#2**+1 **

12 is 15% of **80.**

Setup a proportion. Setting up a proportion allows the calculation to be simpler arithmetically:

\(\frac{12}{x}=\frac{15}{100}\)Simplify the 15/100 by dividing the numerator and denominator by the GCF, 5.

\(\frac{12}{x}=\frac{3}{20}\)Cross multiply and solve for x

\(12*20=3x\)Simplify the left hand side of the equation

\(240=3x\) Divide by 3 on bioth sides to isolate x

\(80=x\)

TheXSquaredFactor
May 22, 2017