A B and C can do a piece of work in 20 30 and 60 days respectively In how many days can A do the work if he is assisted by B and C on every third day

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A B and C can do a piece of work in 20 30 and 60 days respectively In how many days can A do the work if he is assisted by B and C on every third day

12 days

15 days

16 days

18 days

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