20 men can finish a work in 30 days. After how many days should 5 men leave the work so that the work may be finished in 35 days?

20 men can finish a work in 30 days. After how many days should 5 men leave the work so that the work may be finished in 35 days? Correct Answer 15

Let, after x days 5 men left 20 men in 30 days can do 1 portion 1 men in 1 days can do = 1/ 20×30 portion 15 men in ( 35 - x) days can do = 15 ×(35 - x) /20×30 = 35 - x/40 portion x/30 + 35 - x/40 = 1 ( 4x + 105 - 3x) /120 = 1 x = 15
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