time and work 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: a) 1/4 b) 1/10 c) 7/15 8/15 e) None of these 2.A can lay railway …

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time and work 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: a) 1/4 b) 1/10 c) 7/15 8/15 e) None of these 2.A can lay railway …

Read More »