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The length of rope P is three times the length of rope Q. After 10 cm of rope is cut from rope P and rope Q respectively, the length of rope P is four times the length of rope Q. Calculate the original length, in cm, of rope P before it is cut.

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p = 3q, so
3q-10 = 4(q-10)
solve for q, and then p=3q.

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