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| 1. |
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is : |
| Answer» A's 1 day's work = 1 ; 15 B's 1 day's work = 1 ; 20 (A + B)'s 1 day's work = 1 + 1 = 7 . 15 20 60 (A + B)'s 4 day's work = 7 x 4 = 7 . 60 15 Therefore, Remaining work = 1 - 7 = 8 . 15 15 | |