a can do a piece of work 30 days . b can do work in 55 days . in how many days they will complete the work together ?
"lcm = 330 , ratio = 30 : 45 = 6 : 11 no of days = 330 / ( 6 + 11 ) = 330 / 17 = 19.4 days answer : c"
divide(const_1, add(divide(const_1, 30), divide(const_1, 55)))