IXL | Percent of a number: word problems

Mia's Cafe has regular coffee and decaffeinated coffee. This morning, the cafe served 70 coffees in all, 70% of which were regular. How many regular coffees did the cafe serve?

regular coffees

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Learn with an example

question

75% of the 52 coffee mugs at Haley's Pancake House are dirty. How many dirty coffee mugs are there at the pancake house?

coffee mugs

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

Find 75% of 52.

The whole is 52.

The percent is 75%.

Let n represent the part.

Write a proportion to solve for n.

100

100n

75 × 52

100n

3,900

100n ÷ 100

3,900 ÷ 100

There are 39 dirty coffee mugs.

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

part	=	percentage of whole

n	=	75% × 52

n	=	0.75 × 52

n	=	39

There are 39 dirty coffee mugs.

Looking for more? Try these:

Lesson: Percents

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Percent of a number

Lesson: Percents

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