are contractor has a workforce of 350 men who can finish a work in in ninth months how many extra mens are required to finish the work in 7 months?
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Step-by-step explanation:
Total time taken by 420 men to complete the certain piece of work = 9 months
X = 420 * 9 = 3780
Total number of men required to complete the same work in 7 months = x / 7
= 3780 / 7 = 540
Total number of men he need to hire = 540 – 420 = 120
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