A contractor employs 420 men to do some work in 9 months. How many extra men must he employ to complete the work in 7 months?
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Step-by-step explanation:
9×420=7×l2 (T1×l1=T2×l2)
l2=9×420/7
l2=540mens
so extra men require to complete the task in 7 months are (540-420=120mens)
answer is 120
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