a and b can do a piece of work in 16 days , b and c in 24 days , c and a in 12 days . how long will c take to do it ?
"2 c = 1 / 24 + 1 / 12 – 1 / 16 = 1 / 16 c = 1 / 32 = > 32 days answer : d"
divide(multiply(16, const_3), subtract(divide(add(divide(multiply(16, const_3), 12), add(divide(multiply(16, const_3), 16), divide(multiply(16, const_3), 24))), const_2), divide(multiply(16, const_3), 16)))