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A, B and C can do a piece of work in 20, 30 and 60 days respetively. In how many days can A do the work if he is assisted by

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

(a) 10 days 

(b) 12 days 

(c) 15 days 

(d) 20 days

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Correct option (c) 15 days

Explanation: 

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