1.

The efficiency of A is thrice as that of B and efficiency of B is twice as that of C. If B alone can finish a work in 15 days, in how many days A and C together will complete that work?

A. \(6\frac{1}{2}\)
B. \(4\frac{1}{3}\)
C. \(4\frac{2}{7}\)
D. \(7\frac{4}{5}\)
Answer» D. \(7\frac{4}{5}\)


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