Two brothers took the GMAT exam, the higher score is U and the lower one is V. If the difference between the two scores is equal to their average, what is the value of V/U ?  Choose the correct option
A) 3  B) 2  C) 1 / 2  D) 1 / 3  E) there is n ' t enough data to answer the question .

Rationale: answer is d : 1 / 3 u - v = ( u + v ) / 2 solving for v / u = 1 / 3 d
Answer: D