Question 1021778
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C=chickens; P=pigs
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C+P=13
P=13-C
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4P+2C=40
4(13-C)+2C=40
52-4C+2C=40
-2C=-12
C=6
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P=13-C=13-6=7
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ANSWER: There are 6 chickens and 7 pigs.
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CHECK:(leg count)
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4P+2C=40
4(7)+2(6)=40
28+12=40
40=40