Question

'A', 'B' and 'C', alone can complete a piece of work alone in 12 days, 15 days and 20 days, respectively. 'A' started working alone. In how many days will the work be completed if 'A' is assisted by both 'B' and 'C' on every 4th day?

A 12 days
B 10 days
C 7(4/5) days
D 9(1/5) days
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