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
+2446 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
\(80=x\)
