Question

A painting is 24 in. wide by 32 in. long. The width of a postcard reduction of the painting iss 3 in. How long is the postcard?

Answer 1

The postcard is 4 inches long.

Explanation:

Write and solve an equation of ratios, as follows:

24 inches is to 3 inches as 32 inches is to ? inches:

24 32

---- = -----

3 x

Cross-multiplying, we get 24x = (3)(32) = 96. Solving for x: x = 96/24 = 4.

The postcard is 4 inches long.