- A12 days
- B16 days
- C18 days
- D15 days
Step-by-Step Solution
Each 3-day block: A for 3 days plus B and C on day 3 . Five blocks: 15 days.
Answer: D) 15 days
A, B and C can do a piece of work in 20, 30 and 60 days. 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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