A model of a plane in different parts of the atmosphere uses a scale of 1:4,000. If a plane flies at an altitude of 2,000 feet, how high above ground
level is the plane in the model?

A. 8 ft
B. 2 ft
C. 1/4,000 ft
D. 0.5 ft
SUBMIT

D. 0.5 ft

Explanation:

Using the scale :

1 : 4000

This means that an altitude of 4000 feets is represented by 1 unit in the model.

Hence,

1 feet in model = 4000 feet actual altitude

Given an actual altitude of 2000 feets above ground level ;

Feets in the model will be x

1 feet = 4000 feet

x = 2000 feet

Cross multiply :

4000x = 2000

Divide both side by 4000

4000x / 4000 = 2000/4000

x = 0.5

Hence, 2000 feets above ground level corresponds to 0.5 feets in model

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