P and Q can do any work in 8 and 12 days respectively. If P leaves after 3 days of working together and Q calls R and completes the rest of the work in 4 days, how many days does it take R to do the work alone?
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When P, Q and R work together, one-day work = 1/20 + 1/15 + 1/25 = 47/300
Total time taken by P, Q and R to complete the work = 300/47 days
Total work done by Q in (300/47) days = (300/47) × 1/15 = 20/47
Money earned by Q = Total money × Work done by Q
Share of Q = 9600 × 20/47 ≈ Rs. 4085
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