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1/5 of all the cars on a certain auto lot are red

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1/5 of all the cars on a certain auto lot are red [#permalink] New post 31 Jul 2018, 10:27
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85% (00:55) correct 14% (01:21) wrong based on 7 sessions
\(\frac{1}{5}\) of all the cars on a certain auto lot are red, and \(\frac{2}{3}\) of all the red cars are convertibles. What fraction of all the cars are NOT red convertibles?


[Reveal] Spoiler: OA
13/15
.

Last edited by Carcass on 01 Sep 2018, 11:25, edited 1 time in total.
Edited the OA
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Re: 1/5 of all the cars on a certain auto lot are red [#permalink] New post 01 Aug 2018, 10:47
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Please refer to the rules for posting on the board https://greprepclub.com/forum/rules-for ... -1083.html

and how to format a question the easy way https://greprepclub.com/forum/qq-how-to ... -2357.html

Thank you so much.

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Re: 1/5 of all the cars on a certain auto lot are red [#permalink] New post 31 Aug 2018, 20:11
Is the answer correct...please explain
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Re: 1/5 of all the cars on a certain auto lot are red [#permalink] New post 31 Aug 2018, 20:41
What is the correct approach??
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Re: 1/5 of all the cars on a certain auto lot are red [#permalink] New post 01 Sep 2018, 11:24
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Forget this question. It is badly formulated.

First of all the OA is not 14 but 13/15. it is impossible to get a whole number from the statement above.

1/5 of the entire lot is red so 20 cars. Of this 2/3 ar convertible, which means that 13.3 cars are of this type. Which is impossible: you must have a whole number of cars.

Anyway, if we wanna solve we do have 13 cars not covertible over 15. The answer is 13/15.

Hope this helps.

PS: this is an easy question NOT hard.
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Re: 1/5 of all the cars on a certain auto lot are red [#permalink] New post 10 Sep 2018, 07:11
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Let's say we have 300 cars.

1/5 of them are red: 300*1/5 = 60
2/3 of the red cars are convertibles: 2/3*60 = 40
Meaning, 40 out of 300 cars ARE red convertibles. The fraction is 2/15
Question: What fraction of all the cars are NOT red convertibles?
15/15 - 2/15 = 13/15
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Re: 1/5 of all the cars on a certain auto lot are red [#permalink] New post 10 Sep 2018, 07:12
Carcass wrote:
Forget this question. It is badly formulated.

First of all the OA is not 14 but 13/15. it is impossible to get a whole number from the statement above.

1/5 of the entire lot is red so 20 cars. Of this 2/3 ar convertible, which means that 13.3 cars are of this type. Which is impossible: you must have a whole number of cars.

Anyway, if we wanna solve we do have 13 cars not covertible over 15. The answer is 13/15.

Hope this helps.

PS: this is an easy question NOT hard.


We are not told that there are only 100 cars
Re: 1/5 of all the cars on a certain auto lot are red   [#permalink] 10 Sep 2018, 07:12
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