1.

30 men can do a work in 40 days. When should 20 men leave the work so that the entire work is completed in 40 days after they leave the work?

Answer»

10 days



Total work to be DONE = 30 * 40 = 1200

Let 20 men LEAVE the work after 'P' days, so that the remaining work is completed in 40 days after they leave the work.

40P + (20 * 40) = 1200

40P = 400 => P = 10 days



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