a can do a piece of work in 20 days . when he had worked for 2 days b joins him . if the complete work was finished in 8 days . in how many days b alone can finish the work ?
"8 / 20 + 6 / x = 1 x = 10 days answer : e"
subtract(inverse(subtract(multiply(divide(const_1, 8), subtract(const_1, multiply(2, divide(const_1, 20)))), divide(const_1, 20))), add(20, 8))