a and b can do a piece of work in 2 days , b and c in 3 days , c and a in 4 days . how long will c take to do it ?
"2 c = 1 / 3 + 1 / 4 – 1 / 2 = 1 / 12 c = 1 / 24 = > 24 days answer : d"
divide(multiply(2, const_3), subtract(divide(add(divide(multiply(2, const_3), 4), add(divide(multiply(2, const_3), 2), divide(multiply(2, const_3), 3))), const_2), divide(multiply(2, const_3), 2)))