An open box is formed by cutting a 5 inch square measured from each corner and folding up the sides. If the volume of the carton is then 40 in3, what was the length of a side of the original square of cardboard?

Question

anonymous · Answer

The height is 5. The original side is x. The new side x -10.
The base is a square of side x-10 and the height is 5.
How much is the volume in term of x?
Set it equal to 40 and solve for x