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Thirty men take 20 days to complete a job working 9 hours a day.How many hour a day should 40 men work to complete the job? HOW TO DO THIS SUM?PLEASE HELP.
Saptarshi
on 2012-05-02 09:30:00Sorry,this is a pretty childish sum.you being an engg. student should have been able to do this.have you really tried it?apply unitary method. 30 men take 20 days to complete a job working 9 hours a day.1 man takes 20 days to complete it working 270 hours a day.40 men take 20 days to complete it working 270/40=6.75 hours per day. a day takes 15
Saptarshi
on 2012-05-02 09:30:00sorry, the last 4 words have been wrongly posted.
PRATIMA
on 2012-05-04 09:30:00but the answer is 7 1/2hrs.and one more thing i have already got 6.75 answer.but the main question is how 7 1/2hrs is the answer?