Question

Set up a proportion and solve.

1) On a map, the key indicates that 2.5 centimeters equal 10 miles. A
road on the map runs for 30 centimeters. How long is the road?

Answer 1

120 miles

Explanation:

A proportion is a ratio that equals a ratio. I'm going to use cm/miles when I setup the proportion.

`(2.5)/(10) =(30)/(x)`

Cross multiply

2.5x = 300

divide

2.5x/2.5 = 300/2.5

x = 120 miles