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There are infinitely many possible rectangles.

Let A be ANY number in the range (0,6] and let B = 12-A.

Then a rectangle with width A and length B will have a perimeter of 2*(A+B) = 2*12 = 24 units.

Since A is ANY number in the interval (0,6], there are infinitely many possible values for A and so infinitely many answers to the question.

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Q: What are all the rectangles with a perimeter of 24?
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