Question

Bob is wrapping gift boxes. Each gift box is a rectangular prism with a square base of side 9 inches. The difference between the heights of the two gift boxes is 6 inches.

If the larger box has a surface area of 486 square inches, what is the difference in the surface area of the two boxes?
Answer

54 square inches

108 square inches

144 square inches

216 square inches

Answer 1

486= 2*(9*9)+4*(9*(x+6)) sfx x=3 Large box

So now take difference 486-( 2*(9*9)+(4*(3*9))=216