proportional math

Question

The actual width (w) of a regulation soccer field is 90 meters (m), and the actual length is 120 meters (m). A coach has drawn a scale model of the field on a blackboard. If the longest side of his drawing is 18 cm, the other side of the drawing (w) is __________ cm.

Answer 1

90/120= w/18

= 3/4 = w/18

w= 18(3/4) = 9(3)/2 = 27/2 = 13 1/2

the other side = 13.5 cm