Exercise 4 Page 249

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 percent of 20 is equal to 18 by substituting a= 18 and w= 20 into the formula and solve for p% using the Properties of Equality.

Since 0.9 equals 90%, we can complete percent equation. 18= 90% * 20 We found that 18 is 90 % of 20.

Checking Our Answer

Checking Our Answer

We can use a model to check our answer.