a can finish a piece of work in 15 days . b can do it in 30 days . they work together for 6 days and then a goes away . in how many days will b finish the work ?
"6 / 15 + ( 6 + x ) / 30 = 1 = > x = 12 days answer : b"
divide(subtract(const_1, add(multiply(divide(const_1, const_4.0), const_2), multiply(divide(const_1, 30), const_2))), divide(const_1, 30))