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Pearson Algebra 1 Common Core, 2011 View details

9. Percents

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Exercise 24 Page 141

Use the percent proportion.

Practice makes perfect

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= 80 and a= 20, and we are looking for the value of b.

a/b=p/100

SubstituteII

a= 20, p= 80

20/b=80/100

ReduceFrac

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

20/b=4/5

MultEqn

LHS * b=RHS* b

20=4/5 * b

MoveRightFacToNumOne

1/b* a = a/b