IXL | Find what percent one number is of another: word problems

Leroy's Cafe has regular coffee and decaffeinated coffee. This morning, the cafe served 68 coffees in all, 17 of which were regular. What percentage of the coffees were regular?

Write your answer using a percent sign (%).

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Learn with an example

question

Rodrigo's Diner offers its clients a choice of regular and diet soda. Last night, the diner served 90 sodas in all, 90 of which were regular. What percentage of the sodas were regular?

Write your answer using a percent sign (%).

key idea

A percent is 1 part out of 100.

1%
is
equal
to
1
100
or
0.01.

Proportions can be used to solve percent problems.

part

whole

percent

100

solution

100% of a number is the entire number. 100% of 90 is 90. You can check this by doing the math.

The part is 90.

The whole is 90.

Let n represent the percent.

Write a proportion to solve for n.

100

90 × 100

90n

9,000

90n

9,000 ÷ 90

90n ÷ 90

100

100% of the sodas were regular.

You could also find the answer by writing and solving an equation:

part

percentage of whole

100

90n

100

0.9

100

100% of the sodas were regular.

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