Question

Henry is using a total of 16 ft. of lumber to make a bookcase. The left and right sides of the bookcase are each

4 ft. high. The top, bottom, and two shelves are all the same length, labeled S. How long is each shelf?

Answer 1

Answer: Each shelf is 2ft

Explanation:

16 = (2 x 4) + 4s

16 = 8 + 4s

8 = 4s (subtract 8 from both sides)

8/4 = 4s/4 (divide both sides by 4)

2 = s