a and b together can do a work in 4 days . if a alone can do it in 14 days . in how many days can b alone do it ?
1 / 4 – 1 / 12 = 1 / 6 = > 6 answer : b
add(inverse(subtract(divide(const_1, 4), divide(const_1, 14))), divide(const_2, add(const_2, const_3)))