Question
A group of 21 boys, each working
6 hours a day, complete a school project in 15 days. How many days will it take for 18 boys, working 5 hours daily, to finish the same project?Solution
ATQ,
Let the required time be 'd' days. So, 21 × 6 × 15 = 18 × d × 5 Or, 1,890 = 90 × d Or, 'd' = 21
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