Exercise 18 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 number's 0.5% is equal to 12 by substituting p%= 0.005 and a= 12 into the formula and solve for w using the Properties of Equality.

a= p% * w

SubstituteII

p%= 0.005, a= 12

12= 0.005 * w

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Solve for w

DivEqn

.LHS /0.005.=.RHS /0.005.

12/0.005=0.005* w/0.005

CancelCommonFac

Cancel out common factors

12/0.005=0.005* w/0.005

SimpQuot

Simplify quotient

12/0.005=w

CalcQuot

Calculate quotient

2400=w

RearrangeEqn

Rearrange equation

w= 2400

Knowing the value of w, let's look at the completed percent equation. 12= 0.5% * 2400 We found that 12 is 0.5 % of 2400.