Exercise 61 Page 143

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 p= 20 and b= 3, and we are looking for the value of a.

a/b=p/100

SubstituteII

b= 3, p= 20

a/3=20/100

ReduceFrac

a/b=.a /20./.b /20.

a/3=1/5

MultEqn

LHS * 3=RHS* 3

a=1/5*3

MoveRightFacToNumOne

1/b* a = a/b

a=3/5

WriteDec

Write as a decimal

a=0.6

This means that 0.6 is 20 % of 3.