A and B can do a piece of work in 3 days, B and C in 4 days, C and A in 6 days. How long will C take to do it?
Choose the correct choice from the following answers
A) 33 B) 77 C) 24 D) 55 E) 71

Rationale: "2 c = ¼ + 1 / 6 – 1 / 3 = 1 / 12 c = 1 / 24 = > 24 days answer : c"
Answer: C