A is twice as good a workman as B and together they complete a work in 12 days. In how many days A alone can do the work?  Choose one.
A) 32 B) 33 C) 34 D) 35 E) 36

Rationale: a ’ s one day ’ s work : b ’ s one day ’ s work = 2 : 1 ( a + b ) ’ s one day ’ s work = 1 / 12 b ’ s one day ’ s work = 1 / 12 * 1 / 3 = 1 / 36 b alone can do the work in 36 days answer : e
Answer: E