Question

The flagpole casts an 8 foot as shown in the table. At the same time the goal post cast an 18 foot shadow. How tall is the goal post?

Answer 1

12 / 8 = 1.5

1.5 * 20 = 30

therefore the oak tree is 30 feet tall

double check:

8 / 20 = 0.4 = shadow length per ft

30 * 0.4 = 12

Explanation: