Exercise 17 Page 274

Let p represent the percent that 9 is of 20. Write and solve a percent equation using p.

Equation: p % * 20=9
Solution: p=45

Practice makes perfect

Let p represent the percent that 9 is of 20.

We can write a percent equation using p. p % * 20=9 We will solve this equation using the Multiplication Property of Equality. Let's do it!

p % * 20=9

a %=a/100

p/100 * 20=9

a/c* b = a* b/c

p* 20/100 =9

20p/100 =9

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

p/5 =9

Next, we will use the Multiplication Property of Equality to simplify the equation even further.

p/5 =9

LHS * 5=RHS* 5

p/5 * 5=9 * 5

a/5* 5 = a

p=9* 5

p=45

We have that 9 is 45 % of 20.

1 Fractions, Decimals and Percents p.273

2 The Percent Proportion p.273

3 The Percent Equation p.274

4 Percents of Increase and Decrease p.274

5 Discounts and Markups p.275

6 Simple Interest p.275

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