A gift box is a closed square carton with a surface area of 150 square centimeters. Now we need to make a cube outer box to make its volume smaller How much is the length of the edge, which is twice the volume of the original square?

The area of one side of this carton is 150 △ 6 = 25 square centimeters
So the edge length of this carton is 5cm
So the volume of the outer packing box is 5 × 2 = 250 cubic centimeter
So the edge length of the outer packing box = 3 times root 250 = 5 times 3 times root 2cm

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