Discussion :: Time and Work
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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?
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Answer : Option B
Explanation :
| A's 2 day's work = |  | 1 | x 2 |  | = | 1 | . |
| 20 | 10 |
| (A + B + C)'s 1 day's work = | | 1 | + | 1 | + | 1 | | = | 6 | = | 1 | . |
| 20 | 30 | 60 | 60 | 10 |
| Work done in 3 days = | | 1 | + | 1 | | = | 1 | . |
| 10 | 10 | 5 |
| Now, | 1 | work is done in 3 days. |
| 5 |
Whole work will be done in (3 x 5) = 15 days.
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