Question

A map has a scale of 0.7 : 22.1 mi. If Sun Valley and Salem are 3.4 in apart on the map, then how far apart are the real cities?

Answer 1

See explanation.

Explanation:

The scale of the map is:`0.7/22.1`. To calculate the real distance given a distance on a map we have to solve the proportion:

`0.7/22.1=3.4/x`

We can transform it to:

`0.7x=3.4*22.1`

So `x` is:

`x=(3.4*22.1)/0.7`

`x~~107.34`

Answer:

The distance between the cities is about `107.34` miles.