Question: An open box is made from a 10-cm by 20-cm piece of aluminum by cutting a square from each corner and folding up the edges.

An open box is made from a 10-cm by 20-cm piece of aluminum by cutting a square from each corner and folding up the edges. The area of the resulting base is 90 cm2. What is the length of the sides of the squares?

ix 10 cm 20 cm

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