Two brothers took the GMAT exam, the higher score is M and the lower one is N. If the difference between the two scores is equal to their average, what is the value of N/M ?
Choose the correct choice from the following choices.
A) 3  B) 2  C) 1/2  D) 1/3  E) There isn't enough data to answer the question.
M - N = (M + N)/2   Solving for N/M = 1/3   1/3
<result>D</result>
Two brothers took the GMAT exam, the higher score is M and the lower one is N. If the difference between the two scores is equal to their average, what is the value of N/M ?