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didieravoaka
- Master | Next Rank: 500 Posts
- Posts: 163
- Joined: Tue Jan 13, 2015 11:44 am
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Hi didieravoaka,
This question can be solved by TESTing VALUES and some basic conceptual knowledge.
We're told that List K has 7 numbers. We're asked if the average of the list is NEGATIVE. This is a YES/NO question.
1) Four of the seven numbers in List K are negative.
IF the numbers are...
{-1, -1, -1, -1, 0, 0, 0} then the average is negative and the answer to the question is YES.
{-1, -1, -1, -1, 10, 10, 10} then the average is positive and the answer to the question is NO.
Fact 1 is INSUFFICIENT.
2) The sum of the seven numbers in List K is negative.
From this Fact, we know that the SUM is NEGATIVE, so taking the average of the list (re: dividing by 7) will still leave us with a NEGATIVE result. Thus, the answer to the question is ALWAYS YES.
Fact 2 is SUFFICIENT.
Final Answer: B
GMAT assassins aren't born, they're made,
Rich
