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Question

In a group of cows and hens the number of legs are 14 more than twice the number of heads. The numbers of cows is

A
5
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B
7
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C
10
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D
12
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E
can't be determined
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Solution

The correct option is B 7
Let there be x cows and y hens A cow has 4 legs and a hen has 2 legs
4x+2y=2(x+y)+14
4x2x+2y2y=14
2x=14
x=7

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