Math
posted by Jae on .
Derek wants to determine the height of the top of the backboard on the basketball goal at the playground. He places a standard 12inch ruler next to the goal post and measures the shadow of the ruler and the backboard. If the ruler has a shadow of 10 inches and the backboard has a shadow of 8.5 feet, then how high is the top of the backboard?

Cross multiply and solve for x
12/10 = x/8.5