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D 200

Answer

The correct answer is C. One way to set up the proportion is . Cross multiply to get
3w =480, and then divide both sides by three to get 160 women.

Blueprints and Miniatures: Utilizing Scale

Scale drawings, including maps, are common examples that require proportional reasoning. Sometimes
you don't have to go through all the formal steps of solving a proportion to find out the information you are
seeking, but it's proportional reasoning nonetheless.

Example

The scale on a map is 1 inch : 300 miles. If the distance from Phoenix to Los Angeles on this map is
inches, how many miles is it?

1 inch : 300 mi = 2.25 inches : x miles

x = 675 miles

The same process works for comparing the size of regular objects to models of those objects. Model
trains, planes, and cars often state the ratio of model size to real size.

Example

A model car is five inches long and three inches wide. If the actual car is 17 feet long, how wide is it?

5w = 51

w = 10.2 feet

Question

A set of construction drawings for a house has a scale of 1 inch : 2 feet. The house is going to be 28 feet
tall at its highest point. How many inches is that on the drawing?

A 14 inches