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

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): You can put this solution on YOUR website!

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.

John

RELATED QUESTIONS
Square corners, 6 cm on a side, are removed from a 36cm by 42cm piece of cardboard. the... (answered by ankor@dixie-net.com)

A rectangular piece of cardboard is 2 units longer than it is wide. From each of its... (answered by Earlsdon)

A rectangular piece of cardboard is 2 units longer than it is wide. From each of its... (answered by ankor@dixie-net.com)

A rectangular piece of cardboard is 2 units longer than it is wide. From each of its... (answered by scott8148,ankor@dixie-net.com)

A rectangular piece of cardboard is 2 units longer than it is wide. From each of its... (answered by josgarithmetic)

A rectangular sheet of cardboard has a square of the same size cut from each of its... (answered by ankor@dixie-net.com)

Mathew cuts four right angled triangles from the corners of a square cardboard. What is... (answered by macston)

from a square sheet of cardboard 40 cm by 40 cm, square corners are cut out so the sides... (answered by lwsshak3)

from a square sheet of cardboard 8 in by 11 in, square corners are cut out so the sides... (answered by josgarithmetic)