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24 Men can do a work in 35 days. How many men are required to complete the work in 21 days

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answer is B.

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Detailed Solution

24 men – 35 days

? – 21 days

$M_{1} D_{1} = M_{2} D_{2}$

$\frac{35}{21} \times 24 = 40 d a y s$

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