A piece of cardboard has a length of 60cm and a width of 40cm. In order to make the cardboard into an open box, a box with no lid), a piece of length x must be cut out of each corner.

Question

Write an equation to represent each dimension of the box.

Answer 1

From each side, the cut at each end is x, so the length and width left is 60-2x and 40-2x respectively.
The height, when the sides are folded, is x.

Answer 2

12 is