2， and let y be the even number 2 。 Then x/y = 2/2 = 1， which is an integer. For all other values of x and y， x/y is not an integer. The answer is E.

　　6. Is 500 the average score on the GMAT?

　　 Half of the people who take the GMAT score above 500 and half of the people score below 500.

　　 The highest GMAT score is 800 and the lowest score is 200.

　　Many students mistakenly think that implies the average is 500. Suppose　just 2 people take the test and one scores 700 and the other scores 400 。 Clearly， the average score for the two test-takers is not 500. is less tempting. Knowing the highest and lowest scores tells us　nothing about the other scores. Finally， and together do not determine the average since together they still dont tell us the distribution of　

　　I) If x is in S， then 1/x is in S.

　　II) If both x and y are in S， then so is x + y.

　　Is 3 in S?

　　 1/3 is in S.

　　 1 is in S.

　　Consider alone. Since 1/3 is in S， we know from Property I that 1/　= 3 is in S. Hence， is sufficient.

　　Consider alone. Since 1 is in S， we know from Property II that 1 + 1 = 2 is in S. Applying Property II again s

　　hows that 1 + 2 = 3 is in S. Hence， is also sufficient. The answer is D.

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