30 men can do a work in 40 days . when should 10 men leave the work so that the entire work is completed in 40 days after they leave the work ?
"total work to be done = 30 * 40 = 1200 let 10 men leave the work after ' p ' days , so that the remaining work is completed in 40 days after they leave the work . 40 p + ( 10 * 40 ) = 1200 40 p = 800 = > p = 20 days answer : e"
divide(subtract(multiply(30, 40), multiply(40, 10)), 40)