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FARM

by hpgmat » Tue Nov 17, 2009 1:39 pm
A FARM HAS 60 ANIMALS . 2/3 OF THE ANIMALS ARE EITHER COWS OR PIGS. HOW MANY COWS DOES THE FARM HAVE?

1) THE FARM HAS MORE THAN TWICE AS MANY COWS AS IT HAS PIGS
2) THE FARM HAS MORE THAN 12 PIGS
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by linfongyu » Tue Nov 17, 2009 6:07 pm
From the prompt: 2/3*60=40. cow + pigs = 40

1. C > 2P Insufficient. 39 cows, 1 pig. or 38 cows, 2 pigs, etc...

2. P > 12 Insufficient. 13 pigs, 27 cows, or 14 pigs, 26 cows, etc...

Combine
From stem 2, more than 12 pigs = 13. From stem 1 more than twice = 13*2 + 1 = 27. 13 + 27 = 40!
If we try 14 pigs, more than twice = 29, and 14 + 29 > 40.

So the answer is C.
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by hpgmat » Tue Nov 17, 2009 9:52 pm
I AM NOT SURE IF MY UNDERSTANDING OF THE QUESTION IS CORRECT OR YOURS . MY TAKE IS THAT 2/3 rd EITHER COWS OR PIGS MEANS 40 ARE ALL COWS OR ALL PIGS NOT MIX OF COWS AND PIGS
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by linfongyu » Tue Nov 17, 2009 10:12 pm
First a side note - writing in all caps implies that you are SHOUTING...

I'm certain that the question meant the number of cows and pigs adds up to 40.
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by hpgmat » Wed Nov 18, 2009 12:44 am
Thanks
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