Question
A is thrice as efficient as B and can finish a piece of
work in 28 days less than B. B can finish this work in how many days?Solution
Ratio of efficiency of A and B = 3: 1 A will take 1/3 of time as compared to B. Say, B takes 3x days and A takes x days. ∴ 3x – x = 28 ⇒ x = 14 ∴ B takes 14 × 3 = 42 days to do the work
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