Thread: Ratio

Hi in one of my books there is a wall kind of diagram with a double sided arrow and in the middle is 80 m. If i use a ruler How do i know to go by millimeters or centimeters

The diagram shows the face of a wall drawn to scale. What scale has been used?

A) 1:8 (B) 1:80 C)1:800 (D) 1:8000

Determine the length of the diagram in centimeters. Determine the length of the real wall in centimeters (i.e., convert 80 meters to centimeters). Divide the former by the latter.

thanks mate