C= total cars
X= cars with CD players

(2/3)C were rented
(1/3)C were not rented

X=(3/4)C



3/5 of the cars with CD player were rented. That is,
(3/5)X=(3/5)(3/4)C= (9/20)C
is the number of cars rented with CD player.


That means (2/5)X=(2/5)(3/4)C= (6/20)C
Were the cars with CD players not rented.

= (# of cars with CD players not rented)/(# of cars not rented)
= (6/20)C / (1/3)C
= (6/20) / (1/3)
= 18/20
= 9/10

= .9 or 90%

Final Answer: E

Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep 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.