a and b can do a piece of work in 6 days , b and c in 8 days , c and a in 12 days . how long will c take to do it ?
"2 c = 1 / 8 + 1 / 12 – 1 / 6 = 1 / 24 c = 1 / 48 = > 48 days answer : a"
divide(multiply(6, const_3), subtract(divide(add(divide(multiply(6, const_3), 12), add(divide(multiply(6, const_3), 6), divide(multiply(6, const_3), 8))), const_2), divide(multiply(6, const_3), 6)))