Question
63 men can complete a piece of work in 30 days. In how
many days can 21 men complete the same piece of work?Solution
ATQ,
Let's solve this using the work formula: Work = Men × Days (Assuming same efficiency) Given: 63 men × 30 days = Total work Now, 21 men → how many days? Let the required days = x 63×30=21×x 1890=21x 
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