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Pearson Algebra 1 Common Core, 2011 View details

9. Percents

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Exercise 33 Page 142

Use the percent proportion.

What are we finding? A part.
a=142.5

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. Since we are trying to find the percentage of a whole, we are finding a part. We are given the values p= 95 and b= 150, and we will solve for a.

a/b=p/100

SubstituteII

b= 150, p= 95

a/150=95/100

MultEqn

LHS * 150=RHS* 150

a=95/100*150

MoveRightFacToNum

a/c* b = a* b/c

a=95*150/100

ReduceFrac

a/b=.a /50./.b /50.