A contractor engaged 30 persons to construct the road in 30 days but only one fourth of the work was completed after 10 days. How many more persons are required to complete the work in time?
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Because the required duration is 30 days and 10 days was already consumed for the 1/4 of the work done by 30 persons. So the answer to this problem is 15 persons more to complete the remaining works on time.
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