Question

On a set of house plans, the scale is 2 cm : 5 m. If the actual length of a room is 18 m, what is the length of the room on the plans?

(A.) 2.5
(B.) 3.6
(C.) 7.2
(D.) 9

Answer 1

The answer is letter C

Answer 2

C. 7.2 cm

Explanation:

It gives you the proportion.

2cm is to 5 m as 'x' cm is to 18 m

Or

2/5 = x/18

now cross multiply to solve for 'x'

5x = 36

x = 36/5

x = 7.2