For a given set of rectangles, the length varies inversely with the width. In one of these rectangles, the length is 9 and the width is 7. For this set of rectangles, calculate
the width of a rectangle whose length is 21.

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1 3 5

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fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right