Question

An engineer makes a model of a bridge using a scale of 0.5 cm = 3 feet. The length of the actual bridge is 123 feet. What is the length of the model?

Answer 1

20.5 cm

Explanation:

Set up a proportion where x is the length of the model in cm:

`(0.5)/(3)` =
`(x)/(123)`

Cross multiply and solve for x:

3x = 61.5

x = 20.5

So, the model's length is 20.5 cm