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Let x be the width of the rectangle. Then the length is 3x. The area of the rectangle is 3x * x = 3x^2, which also has to be 48. Solving for x, we get that the width is 4, and the length is 12.

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Q: What are the length and width of a rectangle if the length is three times longer than the width the area is 48 sq cm?
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