SOLUTION: Square corners, five units on a side, are removed from a twenty unit by thirty-unit rectangular sheet of cardboard. The sides are folded to form an open box. Find the surface area
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Question 245879: Square corners, five units on a side, are removed from a twenty unit by thirty-unit rectangular sheet of cardboard. The sides are folded to form an open box. Find the surface area of the exterior of the box, in square units.
(A)200 (B) 375 (C) 475 (D) 500 (E) 600 Answer by solver91311(24713) (Show Source):
The exterior surface area of the box will be the total area of the original piece of cardboard minus the area of the cutout pieces. Each of the 4 cutouts is 5 units by 5 units and the original area of the cardboard is 30 times 20.
