Question

A scale drawing of an office building is not labeled, but indicates 1/4 inch=5 feet. On the drawing, one wall measures 2 inches. How long is the actual wall?

Answer 1

40 ft

Explanation:

We can use ratios to solve this problem. Put the scale over the actual size

1/4 inch 2 inches

-------------- = ----------------

5 ft x ft

Using cross products

1/4 x = 2 *5

1/4 x = 10

Multiply each side by 4

4*1/4 x = 4 * 10

x = 40

The wall is 40 ft