A brick wall is being cemented by 12 men in 18 days. If 6 more men are
employed to do the same work, how long will it take to complete the work?
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men's be x. days be y. now add men's 12= x1 . now x2 men's 12+6=18. Now add days y1 =18 y2=? .Add total men's 12+18=30 . Add now days 18+y2. y2=30-18=12.y2 =12days
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