A stack of lumber is 6-feet high. If each piece of lumber is 4-inches thick, how many pieces of lumber are in the stack?

A stack of lumber is 6-feet high. If each piece of lumber is 4-inches thick, how many pieces of lumber are in the stack?

Detailed Explanation

Multiply the height of the stack in feet by 12 to determine the height of the stack in inches: 6 × 12 = 72 inches. Divide that number by 4 inches, the thickness of each board to determine the number of pieces of lumber in the stack: 72 ÷ 4 = 18.