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A, B and C can do a piece of work in 20,...

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? a. `12` days b. `15` days c. `16` days d. `18` days

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RS AGGARWAL-TIME AND WORK-All Questions
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