Question

A can complete a piece of work in 18 days. B can complete the same work in 72 days. While C is 33(1/3)  more efficient than
B. All three started working together. A left 8 days before the work was completed, and C left 17 days before but B continued to work till the end, for how many days did A work?

A 9 days
B 10 days
C 15 days
D 12 days
E None of these
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