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AFAIK, in any official GMAT question, if an answer of a data sufficiency test is D, both statement must yield the same result. Here are the question:

The average of four distinct positive integers is 60. How many integers of these four are smaller than 50?

(1) One of the integers is 200 (2) The median of the four integers is 50

The answer is indeed D because it's sufficient to answer the question using any of the statement, however if you count it, statement (1) yield 3 but statement (2) yield 2. Could the test writer correct this minor problem?

We know definitely that a is less than 50 because in order to find the median the numbers go in order(smaller to larger). So if b+c=100 then definitely b is smaller than 50 and c is larger than 50 having d also larger than 50.

Note that the question says "distinct" so b or c cannot be 50.

I believe you won't get a question like this on the real GMAT. I believe the approach to DS questions is that there is a single problem and you are given 2 pieces of information to the same problem. One may not apply and therefore is insufficient, but if both give you an answer, then I believe the answers should be consistent. Can you state the source of this question? I will be surprised if it is an OG question.
_________________

------------------------------------ J Allen Morris **I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

@GameCode: the official questions, as far as I know, always produce the same number if the answer is D. If the statements gave you a different result, there must be something wrong with your calculation (PS: for this particular question, the OA is D. It's sufficient each on its own, it's just the different results that irks me a little)

@jallenmorris: I got it from gmatclub test. It's a good test, but some word problem can be interpreted in various ways and some data sufficiency (like this one) does not adhere to the official question norm (+ I'm pretty certain that gmatclub test is leaning somewhat to those that have engineering background or at least someone with a degree in calculus since some properties are beyond the basics - it keeps me on my toes though )

lets say a,b,c,d are the numbers. we know the total sum is 240. median lets say is (b+c)/2 = 50 ... that means b+c=100, and a+c=140. How can we use this info to say how many numbers are greater than 50 ?

AFAIK, in any official GMAT question, if an answer of a data sufficiency test is D, both statement must yield the same result. Here are the question:

The average of four distinct positive integers is 60. How many integers of these four are smaller than 50?

(1) One of the integers is 200 (2) The median of the four integers is 50

The answer is indeed D because it's sufficient to answer the question using any of the statement, however if you count it, statement (1) yield 3 but statement (2) yield 2. Could the test writer correct this minor problem?

May I ask why a error found in December 2008 has not been rectified ?

AFAIK, in any official GMAT question, if an answer of a data sufficiency test is D, both statement must yield the same result. Here are the question:

The average of four distinct positive integers is 60. How many integers of these four are smaller than 50?

(1) One of the integers is 200 (2) The median of the four integers is 50

The answer is indeed D because it's sufficient to answer the question using any of the statement, however if you count it, statement (1) yield 3 but statement (2) yield 2. Could the test writer correct this minor problem?

May I ask why a error found in December 2008 has not been rectified ?

I mean in any official GMAT question, if an answer of a data sufficiency test is D, both statement must yield the same result, So this question needs rectification.

In official GMAT questions, the statements don't contradict each other. This rule can be a great help and it is a bit misleading that this particular GMATClub-question doesn't follow it. Nevertheless, the majority of the GMATClub-questions are awesome, so thanks and keep up the great work!