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Pearson Algebra 1 Common Core, 2011
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Pearson Algebra 1 Common Core, 2011 View details
9. Percents
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Exercise 23 Page 141

Use the percent proportion.

400

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= 20 and a= 80, and we are looking for the value of b.
a/b=p/100
SubstituteII

a= 80, p= 20

80/b=20/100
ReduceFrac

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

80/b=1/5
MultEqn

LHS * b=RHS* b

80=1/5 * b
MoveRightFacToNumOne

1/b* a = a/b

80=b/5
MultEqn

LHS * 5=RHS* 5

400 = b
RearrangeEqn

Rearrange equation

b=400
This means that 80 is 20 % of 400.
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arrow_right Lesson Check p.141
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Lesson Check 2 (Page 141)
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Practice and Problem-Solving Exercises 9 (Page 141)
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