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A can do a work in 15 days and B in 20 days.If they together work on it for 4 days, then the fraction of the work that is left is:
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8 15 -
7 15 -
1 4 -
1 10
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Correct Option: A
Using basics of Rule 2,
| A’s work per da = | 15 |
| B’s work per day = | 20 |
(A+ B)’s work per day
| = | + | = | = | |||||
| 15 | 20 | 60 | 60 |
∴ (A + B)’s work in 4 days
| = 4 × | = | |||
| 60 | 15 |
| Left work = 1 - | 15 |
| = | = | |||
| 15 | 15 |
