36 men can white wash a building 140 m long in 21 days. How many men are needed to white wash the similar building 50 m long in 6 days
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1 man-day = 140/(36*21) = 5/27 m
1 man can build 5/27m of wall in one day.
1 man can built (18)(5/27) = 10/3 m of wall in 18 days.
The number of men needs to build 50 m of wall in 18 days is:
50/(10/3) = 150/10 = 15 men
15 men can build 50 m of wall in 18 days
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