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Of the 60 animals on a certain farm, 2/3 are either pigs or [#permalink]
 22 Jan 2006, 23:59
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.
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If it is E I will Explain
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The ans is C. This is a tricky one.
Questions stem gives us P+C=40.
1) says C=2P+r, so basically P=(40-r)/3, multiple value possible.
2) says P>12, again multiple values possible.
Combining 1) and 2), min P=13. If P is more than 13, C is more than 28 and the sum exceeds 40. So P=13, C=27.
Ans = (C).
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Total pigs and cows = 40
St1: Could be 1, 39 or 2,38 etc etc.... INSUFF
St2: Could be 13, 27 or 14, 26 etc etc.... INSUFF
Combined:
Only case that satisfies both the statements is 13,27.
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ps_dahiya wrote: Total pigs and cows = 40
St1: Could be 1, 39 or 2,38 etc etc.... INSUFF
St2: Could be 13, 27 or 14, 26 etc etc.... INSUFF
Combined:
Only case that satisfies both the statements is 13,27.
I guess we are both wrong C should be the answer
The farm has more than twice as many cows as it has pigs. Hence there could be only 13 pigs and 27 cows
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Here is the blunder I did. The question says "2/3 are either pigs or cows" and I thought 40 are either pigs or cows not both. How stupid?  
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Bhai wrote: Here is the blunder I did. The question says "2/3 are either pigs or cows" and I thought 40 are either pigs or cows not both. How stupid? The true is born in dispute))
Bhai wish I were so stupid as you are)))  
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C...
C+P = 2/3(60) = 40.
I. C > 2P gives 40 = ( greater than 2P ) + P....INSUFF.
II. P > 12 . If P = 13, then C could be 27. If P =14, then C could be 26.INSUFF.
I + II gives
40 = greater than 2P + P ( which is greater than 12 )/
Let P =12, then 40 = (>2P) + 13...the number of cows has to be 27.
Let P =13, then 40 = (>2P) + 14..the number of cows need to be greater than 28, but then the total is greater than 40...INVALID.
Thus C = 27 and P = 13.
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Yurik79 wrote: ps_dahiya wrote: Total pigs and cows = 40
St1: Could be 1, 39 or 2,38 etc etc.... INSUFF
St2: Could be 13, 27 or 14, 26 etc etc.... INSUFF
Combined:
Only case that satisfies both the statements is 13,27. I guess we are both wrong C should be the answerThe farm has more than twice as many cows as it has pigs. Hence there could be only 13 pigs and 27 cows I replied C already. There is only one case when both the statements are taken together. So it means, its SUFF.
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my answere is also C
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watever wrote: The ans is C. This is a tricky one.
Questions stem gives us P+C=40.
1) says C=2P+r, so basically P=(40-r)/3, multiple value possible.
2) says P>12, again multiple values possible.
Combining 1) and 2), min P=13. If P is more than 13, C is more than 28 and the sum exceeds 40. So P=13, C=27.
Ans = (C).
i missed C=2P+r --> I overlook things easily.. thats y i scored less last time. 
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vazlkaiye porkalam vazltuthan parkanum.... porkalam maralam porkalthan maruma
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2/3 are either pigs or cows means 40
a) Pigs =x Cows >2x Insuff
b)>12 pigs Insuff
Combine
and 3x<=40=>x<=13 with B we know only x=13 stands out , so remaining are cows
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I did the same mistake as Bhai. I thought that we had only cow and pigs in the farm, and that we had either 40 pigs + 20 cows, or 40 cows + 20 pigs...
I guess I have to work my verbal a bit tougher then ...
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