The length on a drawing is 9cm and the scale is 2cm to 40km find the actual lenght

Answer 1

2 cm / 40 km = 9 cm / x km

2 / 40 = 9 / x

Ccross multiply.

2 x = 360

x = 360 / 2

x = 180 km

OR

9 cm / 2 cm = 4.5

4.5 ∙ 40 km = 180 km