For all real numbers v, an operation is defined by the equation v* = v - v/3. If (v*)* = 12, then v=
Choose the correct choice from the following answers:
A) 15  B) 18  C) 21  D) 24  E) 27

Rationale: ( v * ) * = ( v - v / 3 ) - ( v - v / 3 ) / 3 12 = 2 v / 3 - 2 v / 9 = 4 v / 9 v = 27 the answer is e .
Answer: E