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 Post subject: 25 Cars
PostPosted: Mon May 04, 2009 5:55 pm 
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Joined: Sun Apr 19, 2009 6:07 pm
Posts: 1
Of the 25 cars sold at a certain dealership yesterday, some had automatic transmission and some had anti-lock brakes. How many of the cars had a automatic transmission but not antilock brakes?

(1) all of the cars that had anti-lock brakes also had an automatic transmission
(2) 2 of the cars had neither automatic transmission nor anti-lock brakes

I don't get it !


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 Post subject: Re: 25 Cars
PostPosted: Mon May 04, 2009 9:33 pm 
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Joined: Mon Apr 06, 2009 5:44 pm
Posts: 81
Lets look at (1). All cars that had anti-lock breaks also had automatic transmissions, but did all cars with automatic transmissions have anti-lock breaks ? There is no way to determine the latter. A Fails.

B Also fails. All (2) tells us is that there are 23 that have either automatic, anti-lock, or both. There is no way to deduce how many automatic cars there are without anti-lock breaks. We can eliminate Choices A, B, and D. C also fails.

C simply tells us that of the 23 cars left all the anti-lock break cars were automatic, it tells us nothing about the automatic cars having anti-lock breaks. The statements together are inconclusive. The correct answer is E.

Take care,
Steve


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