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Ratios & Percentages

Ratios & Percentages

Example 1

4/5 = x/15

Cross multiply and set equal to each other.

Example 2

4/5 = x/15

Example 3

2/3 = x/4.5

Cross multiply and set equal to each other.

Example 4

2/3 = x/4.5

Example 5

An Alaskan wildlife preserve Ranger wants to figure out how many moose live in the preserve. To do this, she randomly catches and tags 50 moose and releases them. A few months later, she catches 75 moose and sees that 20 of them are tagged. Approximately how many moose live on the preserve?


Example 6

The ratio of girls to boys in your class is 4:5. Assuming that this ratio is consistent throughout the school, approximately how many boys would be in a school of 525 students?

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