A can do a piece of work in 12 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?
Choose the correct choice from the following answers.
A) 2
B) 4
C) 18
D) 6
E) 9
Explanation:   8/12 + 6/x = 1   X = 18 days   Answer:18
<result>C</result>
A can do a piece of work in 12 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?