I'll give you a question, please answer with step-by-step reasoning process.
A can do a piece of work in 9 days. When he had worked for 2 days B joins him. If the complete work was finished in 8 days. In how many days B alone can finish the work?\nOptions:\n(A) 18\n(B) 77\n(C) 66\n(D) 54\n(E) 12

(D)
8/9 + 6/x = 1\nX = 54 days.

Final answer: (D)