If 20 men can construct n wall in 5 days, then 10 men can construct the same wall in ____ days .

– by 0

A. 10
B. 13
C. 5
D. 23

20 x w x 5 = W
10 x w x X = W 
Equating both equations, we get,
10 x W x X = 20 x w x 5
X = 100/ 10 
X = 10 

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