A work force of 420 men with a contractor can finish certain piece of work in a 9 months .How many extra men must he employ to complete the job in 7 months?
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540 men as 420/7X 90 = 540
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answer: 540 workers..
employ needed for 7 months = (420*9)/ 7
= 540
employ needed for 7 months = (420*9)/ 7
= 540
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