-
late4thing
- Junior | Next Rank: 30 Posts
- Posts: 11
- Joined: Thu Oct 15, 2015 2:14 pm
This question is a basic C trap question, one which is set up in such a way that C in a way seems to be the right answer even though C is not actually the right answer.
To answer the question, "How much is x percent of a certain number?", one seemingly would need to know what x is and what the number is. That's what makes this question a C trap.
Statement 1: x = 60
This tells us only what x is and provides no information on the number.
Insufficient.
Statement 2: 2x percent of the number is 24
From this we get no clue regarding the value of the number or of x.
However, if we were to combine this information with the information in Statement 1, we could figure out the value of the number, and then we could multiply the number by .60 to find the answer to the question.
Of course, doing that is unnecessary, because instead we could just divide Statement 2 by 2 to get the following.
x percent of the number is 12.
So, interestingly, we can get the answer to the posed question without knowing what x is or what the number is.
Sufficient.
While this is not a very challenging question, it does exemplify a key point for DS. Often answers to DS questions can be found without finding the values of the variables involved.
The correct answer is B.
