The question is: Is k > n ?
Statement (1) is insufficient. It tells us n = 2k - 200. If k is greater than 200, then n is greater. For instance, if k = 300, then n = 2(300) - 200 = 400. However, if k is smaller than 200, the opposite is true. If k = 150, then n = 2(150) - 200 = 100. We don't know the range of values for either k or n, so we can't answer the question.
Statement (2) is also insufficient. This doesn't tell us anything about the relationship between the donations, or about Nell's amount.
Taken together, the statements are sufficient. Since we know k is greater than 250, it must be greater than 200, meaning that Nell's contribution was greater, according to the equation in (1). Choice (C) is correct.
Got Kudos? Tis better to give than receive | ANALYSIS OF MOST DIFFICULT QUESTION TYPES
Need motivation? check out this video or this one | "We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle
100 HARDEST CR QUESTIONS | 100 HARDEST SC QUESTIONS | 100 HARDEST PS QUESTIONS| 25 HARDEST QUESTIONS | 225 RC PASSAGES W/ TIMER!!!
PS QUESTION DIRECTORY|DS QUESTION DIRECTORY | SC QUESTION DIRECTORY | CR QUESTION DIRECTORY | RC QUESTION DIRECTORY
BEST OVERALL QUANT BOOK FOR THE MONEY | MAXIMIZE YOUR STUDY TIME