Exercise 12 Page 141

In the percent proportion, the ratio of the part a to the whole b is equal to the percent p written as a fraction. a/b=p/100 Given any two of these three variables, we can find the third one. In this exercise, we are given the values a= 40 and b= 32, and we are looking for the percent p.

a/b=p/100

SubstituteII

a= 40, b= 32

40/32=p/100

ReduceFrac

a/b=.a /8./.b /8.

5/4=p/100

MultEqn

LHS * 100=RHS* 100

500/4=p

CalcQuot

Calculate quotient

125 = p

RearrangeEqn

Rearrange equation

p=125

This means that 40 is 125 % of 32.