a and b can do a piece of work in 2 days and 6 days respectively . both work for 1 days and then a goes away . find how long will b take to complete the remaining work ?
1 / 2 + ( 1 + x ) / 6 = 1 x = 2 days answer : b
divide(subtract(const_1, add(divide(1, 6), divide(1, 2))), divide(1, 6))