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2014-06-04T11:08:48+08:00

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We represent P as number of pigs, C as cows and H as horse

We know that 9=P+C.......1
10=C+H..........................2
6=P+C+H........................3

1+2= P+C+C+H = P+2C+H=10+9=19.......4

4
-3= (P+2C+H) - (P+C+H)= C = 19-6 = 7

There will be 7 cows but it is not possible. I think there is something wrong with the question.
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