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Of the 60 animals on a certain farm, 2/3 are either pigs or

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Of the 60 animals on a certain farm, 2/3 are either pigs or [#permalink] New post 08 Apr 2012, 00:39
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Of the 60 animals on a certain farm, 2/3 are either pigs or cows. How many of the animals are cows?

(1) the farm has more than twice as many cows as it has pigs.
(2) The farm has more than 12 pigs.


Can some please explain this in detail.
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Re: DS GMATPREP [#permalink] New post 08 Apr 2012, 00:48
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Of the 60 animals on a certain farm, 2/3 are either pigs or cows. How many of the animals are cows?

2/3 of 60 animals are either pigs or cows. So there are total of 40 cows and pigs.

(1) The farm has more than twice as many cows as it has pigs --> c>2p --> as c+p=40 then c=40-p --> 40-p>2p --> 13.3>p --> p_{max}=13 and c_{min}=27. Many combinations are possible: (27,13), (28, 12), ... Not sufficient.

(2) p>12. Not sufficient

(1)+(2) p>12 but p_{max}=13, hence p=13 --> c=27. Sufficient.

Answer: C.

In case of any question please post it here: of-the-60-animals-on-a-certain-farm-2-3-are-either-cows-or-92062.html
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Re: DS GMATPREP   [#permalink] 08 Apr 2012, 00:48
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