a can do a piece of work 40 days . b can do work in 60 days . in how many days they will complete the work together ?
"lcm = 120 , ratio = 40 : 60 = 2 : 3 no of days = 120 / ( 2 + 3 ) = 90 / 5 = 24 days answer : e"
divide(const_1, add(divide(const_1, 40), divide(const_1, 60)))