A can complete a piece of work in 15 days. B is 30% more efficient than A. If they work together, how many days will it take to complete the work?
B's efficiency = 130% of A's efficiency = 1.3 * (1/15) = 13/150 A and B's combined daily work = 1/15 + 13/150 = 23/150 They will take 150/23 ≈ 6.5 days to complete the work. Answer: (B)
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