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OpenStudy (anonymous):
M is the midpoint of the line joining P and Q. R lies on PQ produced, such that PR = 3PQ . Find PM : PR .
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OpenStudy (anonymous):
let PM=a, then MQ=a.Let QR=b then PR=2a+b, 3Q=6a, so b=4a. Now PM:PR=a:2a+b=a:6a=1:6
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