Question
20 men can finish a work in 220 days, but at the end of
90 days, 20 additional men are employed. In how many more days will the work be completed?Solution
 (20 × 90) + (40 × x) = 220 × 20 40x = 4400 – 1800 40x = 2600  x = 65days
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L...
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