Cars and students

[Brent@GMATPrepNow]

In a group of 80 college students, how many own a car?
(1) Of the students who own a car, 14 are male
(2) Of the students who do not own a car, 42% are female

[cramya]

I am getting E)

[720dreaming]

Getting C. x=own a car

from A

(x-14)=Female

From B

(80-x)(.42)=Female

2 equations, 2 unknowns.

Is there a flaw in my logic?

[logitech]

Getting C. x=own a car

from A

(x-14)=Female

From B

(80-x)(.42)=Female

2 equations, 2 unknowns.

Is there a flaw in my logic?

(x-14)=Female who have cars!
(80-x)(.42)=Female who does not have cars.

So not same kind of girls

[720dreaming]

I was expecting someone to correct my logic, something was missing in the question (based on my intuition), but formula SEEMED to work.

Thanks.

[720dreaming]

I was expecting someone to correct my logic, something was missing in the question (based on my intuition), but formula SEEMED to work.

Thanks.

[vishubn]

80 students----

A) of the students...14 male... no info on female.... INsuff

B) Same reasoning !! Insuff

C)Nothing

IMO E

vishu

[Brent@GMATPrepNow]

Hint: [spoiler]it's not E[/spoiler]
Another hint?

[logitech]

In a group of 80 college students, how many own a car?
(1) Of the students who own a car, 14 are male
(2) Of the students who do not own a car, 42% are female

St1) Insuf. We need to know females who own a car.
St2) 42% female, 58%male

42+58=100 but we have only 80 students.

if we keep the same ratio:

21 female / 29 male ( here is the magic in this question, 29 is a prime number so ) 21 female and 29 males do not have any car = 50 people

so 80-50 = 30 people have car - SUF

Choose B, great question.

[cramya]

Brent,
If the question is complete as is then pl dont give any hints. This way we know what we missed.

[Brent@GMATPrepNow]

Exactly - we can't find 42% of many numbers and get a whole number (i.e., a whole person). Given the 42% part, this means that there must be 50 people without a car, and thus 30 people with a car.

Awesome! Great work, Logitech.
I think you're ready to take the GMAT