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

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Manager
Joined: 20 Sep 2007
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Of the 60 animals on a certain farm, 2/3 are either pigs or cows [#permalink]

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05 Jul 2008, 21:09
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

OA TO FOLLOW

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Senior Manager
Joined: 18 Jun 2007
Posts: 287

Kudos [?]: 60 [2], given: 0

Re: GMAT prep pigs or cows? [#permalink]

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05 Jul 2008, 23:03
2
KUDOS
of the 60 animals 40 (2/3 of 60) are either pigs or cows

St.1 : more than half of 40 are cows
=> assume no. of pigs as X then
x + 2x = 40
=> x = 13.abc and 2x = 26.abc. means cows must be more that 26
but we dont know the how many so St1. insuff.

St.2: The farm has more than 12 pigs .....clearly insuff.
only thing is suggests that there are less then 28 cows

Combined: bothe statements together suggest that pigs(x) are 12< x < 14
=> x= 13. means there are 13 pigs and 27 cows

Ans is C

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Senior Manager
Joined: 23 May 2006
Posts: 322

Kudos [?]: 367 [2], given: 0

Re: GMAT prep pigs or cows? [#permalink]

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05 Jul 2008, 23:03
2
KUDOS
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

2/3 * 60 = 40 P and C

S1. x : 2x, 3x = 40 not perfectly divisible
S2. P > 12

Combine 13P + 27C = 40 , 27> 2*13

Kudos [?]: 367 [2], given: 0

VP
Joined: 03 Apr 2007
Posts: 1344

Kudos [?]: 800 [0], given: 10

Re: GMAT prep pigs or cows? [#permalink]

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06 Jul 2008, 17:57
neeraj.kaushal wrote:
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

OA TO FOLLOW

c+p = 40

1. c>2p

if c= 2p , p =40/3 = 13.XX

if p = 13, C = 40-13 = 27

Suff

2. p>12

p= 13, c= 40-13

p= 14, c= 40-14

Insuff

A

Kudos [?]: 800 [0], given: 10

Re: GMAT prep pigs or cows?   [#permalink] 06 Jul 2008, 17:57
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