A contractor engages 54 workers to complete a job in 21 days. After working for 3 days, he found that he would
get the work completed in 28 days if he does not increase the number of workers. How many more workers
should he engage to get the work done in time?
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Answer is 23 worker. The contractor assumed to complete the contract work in 21 days by using 54 labourers. But after three days only he realised that it will take another 28 days to complete the work. So the actual man power needed to complete the job is 54 X 28 = 1512 man power days.
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