The fastest way to go about this is to simply determine what each point really says and if its possible to have different solutions.

For one this is definitely the case, because we can have 20 students own a car or we can have 30, we have no idea, so it is insufficient.

Two is a little bit more tricky, let's look at what it is actually saying here: of the students who own a car 42% must be female. We have to remember that, because it is people, they have to be whole numbers. 42% is equal to 21/50, which cannot be simplified any more, so we know that the number of students who own a car must be a multiple of 50. The only multiple of fifty that works with the constraint that there must be 80 people is 50 itself, therefore we know that this is sufficient.
_________________

Nice question really. At first i didn't understand what about males that own a car but now i got it. let's bump this question for practice
_________________

Is it possible to solve this using the table method? I used the table method and got E because in the table it looks like there is not enough information.

OK. This morning really killed my morning blues...Awesome question! OA B!
_________________

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________