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Question:

On a map drawn to scale, 1/2 inch equals 1 mile. What length on the map equals 5 miles?

A 2.5 inches
Explaination

Multiply the scale measurement for 1 mile (1/2 inch per mile) by 5 miles: 1/2 × 5 or 1/2 × 5/1 = 5/2. Reduce this fraction, and you get 2.5 inches.