A contractor undertakes to dig a canal 12 km long in 350 days and employs 45 men. after 200 days he finds that only 4.5 km of the canal has been completed. find the number of extra men he must employ to finish the work in time. 1) 45 men 2) 55 men 3) 65 men 4) 75 men
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very easy,youfind the rate of one man then can liao
voila!
the answer is two
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