Question

Julie is creating a poster from a picture that is 5 inches wide by 7 inches long. The poster will be 7 feet wife. How long, in feet, will the poster be?

Answer 1

9.8 feet long

Explanation:

We'll assume that the photo is to be scaled up from inches to feet. The increase in the width dimension is from 5 inches (wide) to 7 feet (wide). Convert the 7 feet into inches (7'*12" = 84").

Now we can calcullate a ratio of the old scale to the new:

(New Width)/(Old Width) = 84"/5" = 16.8

The phot is being made 16.8 times larger for the poster.

Use the same ratio to scale up the length of 7 inches:

(7")*(16.8) = 117.6 inches

(117.6")*(1 foot/12") = 9.8 feet long