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P – 20 days P – 6 unit Q – 24 days LCM = 120 Q – 5 unit R – 30 days R – 4 unit Work of all 3 per day is (6 + 5 + 4) – 15 units All worked for 4 days. So, 4 days work is 4 × 15 = 60 units Remaining work = 120 – 60 = 60 units That work done by Q and R their per day unit = (5 + 4) = 9 unit Remaining work done by Q and R is `60/9` days =`6 2/3` days
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