Question
Binny is 20% more efficient than
Ankush, while Ankush is 50% more efficient than Raju. If the three of them—Ankush, Binny, and Raju—working together can finish a task in 45 days, how many days will Binny need to complete 72% of the same task on his own?Solution
ATQ,
Let efficiency of Raju is 10x units per day Efficiency of Ankush = 1.5 Ă— 10x = 15x units per day Efficiency of Binny = 1.2 Ă— 15x = 18x units per day Total work = (10x + 15x + 18x) Ă— 45 = 43x Ă— 45 units Time taken by Binny alone = (0.72 Ă— 43x Ă— 45)/18x = 77.4 day
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