Question

Thirty men take 20 days to complete a job working 9 hours a day. How many hours a
day should 40 men work to complete the same job?
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Answer 1

Time taken to complete work =20*9

=180 hours

Time taken for 1 man to complete the work=180*30=5400

Time taken to complete work by 40 men=5400/40=135 hours

therefore they can work for 5 hours a day for 27 days