The perimeter of a rectangle is 120 centimeters. The base is 3 times the height. What are the dimensions of the rectangle?

The perimeter is 2(base + height) = 120, so the base and height add to 60. Since the base is 3 times the height, 3h + h = 60, giving h = 15 cm and base = 45 cm. The matching choice is h = 15 cm, b = 45 cm.

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