A can finish a piece of work in 5 days. B can do it in 16 days. They work together for two days and then A goes away. In how many days will B finish the work?
Select the correct option.
A) 4	B) 5	C) 6	D) 7	E) 8

Rationale: "2 / 4 + ( 2 + x ) / 16 = 1 = > x = 6 days answer : c"
Answer: C