a and b can do a piece of work in 4 days , b and c in 6 days , c and a in 3 days . how long will c take to do it ?
"2 c = 1 / 6 + 1 / 3 – 1 / 4 = 1 / 4 c = 1 / 8 = > 8 days answer : a"
divide(multiply(4, const_3), subtract(divide(add(divide(multiply(4, const_3), 3), add(divide(multiply(4, const_3), 4), divide(multiply(4, const_3), 6))), const_2), divide(multiply(4, const_3), 4)))