Exercise 10 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= 75 and b= 15, and we are looking for the percent p.

a/b=p/100

SubstituteII

a= 75, b= 15

75/15=p/100

ReduceFrac

a/b=.a /15./.b /15.

5/1=p/100

MultEqn

LHS * 100=RHS* 100

500=p

RearrangeEqn

Rearrange equation

p=500

This means that 75 is 500 % of 15.