Efficiency of A, and B are in the ratio of 3 : 4. If both can do a work together in 30 days. Find out how much days A will take to complete the work alone?

Efficiency ratio of A : B = 3 : 4 Both work together in = 30 days A take = (total of efficiency × total days)/(A efficiency) => (7 × 30)/3 = 70 days

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