Exercise 13 Page 251

The percent equation is an equation in which the part is equal to the product of the corresponding percent and the whole. We can represent a is p percent of wwith the following equation. a= p% * wWe can find what 20% of 150 is by substituting p%= 20100 and w= 150 into the formula and solve for a using the Properties of Equality.

a= p% * w

SubstituteII

p%= 20/100, w= 150

a= 20/100 * 150

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Solve for a

MoveRightFacToNum

a/c* b = a* b/c

a=20* 150/100

Multiply

Multiply

a=3000/100

CalcQuot

Calculate quotient

a= 30

Knowing the value of a, let's look at the completed percent equation. 30= 20% * 150 We found that 30 is 20 % of 150.

Checking Our Answer

Checking Our Answer

We can use a model to check our answer.