Question

On a scale drawing, 1 millimeter equals 4 centimeters. If a line on the drawing is 45 millimeters, how many meters is it actually?

18 m
180 m
1,800 m
1.8 m

Answer 1

1.8 m

Explanation:

Answer 2

D. 1.8 m

Explanation:

On a scale drawing,

1 millimeter = 4 centimeters.

A line on the drawing is 45 millimeters, then

1 mm - 4 cm

45 mm - x cm

Write a proportion:

`(1)/(45)=(4)/(x)`

Cross multiply:

`x=45\cdot 4\\ \\x=180\ cm`

Note that

`1\ m=100\ cm,`

then

1 m - 100 cm

y m - 180 cm

Write a proportion:

`(1)/(y)=(100)/(180)`

Cross multiply:

`100y=180\\ \\y=1.8\ m`