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Q.
If 20 men take 40 days to complete a job, in how many days can 25 men complete the job?
Time and Work, Pipes and Cisterns
Solution:
If 20 men can complete the job in 40 days, then the work measured in terms of mandays is $20 \times 40=800$.
If this work is to be done by 25 men, then the number of days they will take is $\frac{800}{25}=32$.