If 20 men can build a wall 56 metres long in 6 days, then the length of a similar wall can be built by 35 men in 3 days is

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52 meters

49 meters

42 meters

36 meters

answer is B.

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Detailed Solution

W_{1} = 56 m

D_{1} = 6 d a y s

M_{1} = 20 m e n

D_{2} = 3 d a y s

M_{2} = 35 m e n

W_{2} = ?

$\frac{M_{1} \times D_{1}}{W_{1}} = \frac{M_{2} \times D_{2}}{W_{2}} \Rightarrow \frac{20 \times 6}{56} = \frac{35 \times 3}{W_{2}} \Rightarrow W_{2} = 49 m$

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