a can finish a piece of work in 5 days . b can do it in 25 days . they work together for four days and then a goes away . in how many days will b finish the work ?
"4 / 5 + ( 4 + x ) / 25 = 1 = > x = 1 day answer : b"
divide(subtract(const_1, add(multiply(divide(const_1, 5), const_2), multiply(divide(const_1, 25), const_2))), divide(const_1, 25))