Glencoe Math: Course 2, Volume 1
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Glencoe Math: Course 2, Volume 1 View details
4. The Percent Equation
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Exercise 22 Page 135

To solve problems that involve percent, use the percent equation.

Equation: 84 = 0.75* w
Solution: w = 112

Practice makes perfect

Let's start by recalling that we can use the percent equation to solve problems that involve percent. Percent Equation [0.3em] part = percent * whole In this case, we want to find the number of which 75 % is 84, which means that we want to find the whole. Let w represent the whole. 84 = 75 % * w Before we can solve the equation that we got, we need to write the percent as a decimal. We can write a percent as a decimal by ignoring the percent symbol and moving the decimal point two places to the left.

percent as decimal: 0.75

We got that 75 % is equal to 0.75. 84 = 75 % * w [0.3em] ↓ [0.3em] 84 = 0.75 * w Finally, let's solve the equation for w. To do so, we will use the Division Property of Equality.

84=0.75 * w
84/0.75=0.75w/0.75
84/0.75=0.75w/0.75
84/0.75=w
112=w
w=112

We found that w= 112 is a solution to the equation. This means that 84 is 75 % of 112.