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?  Select
A) 28 days  B) 76 days  C) 16 days  D) 18 days  E) 19 days

Rationale: 8 / 12 + 6 / x = 1 x = 18 days answer : a
Answer: A