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72% of 90 = 80

A percent is 1 part out of 100.

1%isequalto

1

100

or0.01.

Proportions can be used to solve percent problems.

part

whole

=

percent

100

solve

The part is 72.

The percent is 90%.

Let n represent the whole.

Write a proportion to solve for n.

72

n

=

90

100

90n = 72 · 100

90n = 7,200

90n ÷ 90 = 7,200 ÷ 90

n = 80

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Anonymous

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4y ago

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