Question

Cindy uses 1-inch cubes to find the volume of a jewelry box shaped like a rectangular prism. She uses 780 cubes to completely fill the jewelry box with no gaps or overlaps. If the jewelry box is 13 inches long and 5 inches wide, how tall is Cindy’s jewelry box?

Answer 1

Her box is 12 inches tall.
-Because if you multiply 13 × 5, you get 65 (this is the base) then you work backwards and divide 780 by 65 (780 ÷ 65). Therefore your answer is 12 inches