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6 men can complete the electric fitting in a building in 7 days. How many days will it take if 21 men do the job?

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6 men can complete the electric fitting in a building in 7 days. How many days will it take if 21 men do the job?
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Given,

 6 men can complete the work in = 7 days

 ∵ 1 man can complete it in = 6 × 7 = 42 days

∴ 21 man will complete it in \(=\frac{42}{21}\)= 2 days

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