The perimeter of a rectangle is 60 centimeters. The base is 2 times the height. What are the dimensions of the rectangle?

The perimeter is 2(h + b) = 60, so h + b = 30. Since the base is twice the height, b = 2h; therefore 3h = 30, giving h = 10 cm and b = 20 cm. The correct choice is h = 10 cm, b = 20 cm.

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