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A and B can do a job together in 7 days. A is 1 times as efficient as B. The same job can be done by A alone in :

Answer» (A's 1 day's work) : (B's 1 day's work) = 7 : 1   =   7 : 4. 4 Let A's and B's 1 day's work be 7x and 4x respectively. Then, 7x + 4x = 1         11x = 1         x = 1 . 7 7 77 A's 1 day's work = 1 x 7 = 1 . 77 11


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