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Problem 13 - Entrance Test

What is the volume of a cube whose surface area is 150?

Correct: C

Let s be the side length of the cube. The surface area of a cube is 6s^2, so 6s^2 = 150. Then s^2 = 25, so s = 5. The volume of a cube is s^3, so the volume is 5^3 = 125.