Question

12. A staffs shadow is 8 feet and a tree's shadow is 16 feet. If the staff is 9 feet tall, how tall is the tree?

A. 15 ft
B. 18 ft
C. 12 ft
D. 9 ft

Answer 1

18 ft

Explanation

1. Put 8/16 like a fraction and since we do not know the height of the tree yet we put the height as 9/d.

2. We have to cross multiply so we multiply 8 by d and we get 8d. Then we multiply 9 by 16 and we get 144.

3. We divide both sides by 8 so we can get (d) by itself and we divide 144 by 8 also.

4. We get d = 18

The answer is correct but my explanation is a little hard to read so sorry about that :)