A is twice as good a workman as B and they took 11 days together to do the work B alone can do it in.  Choose the most appropriate option:
A) 17 days  B) 12 days  C) 29 days  D) 25 days  E) 33 days

Rationale: "wc = 2 : 1 2 x + x = 1 / 11 x = 1 / 33 = > 33 days answer : e"
Answer: E