I know this is simple, but I don't understand the English of this problem: An open box, no more than 5 cm in height, is to be formed by cutting four identical squares from the corners of a sheet of metal 25 cm by 32 cm, and folding up the metal to form sides. The capacity of the box must be 1575 cm^3. What is the side length of the squares removed? Anyone that cares to help or explain this problem will be welcome! Thanks in advance!