In a group of cows and hens, the number of legs are 14 more than twice the number of heads. The number of cows is	Pick:  A) 5  B) 7  C) 10  D) 12  E) 14
Explanation:   Let the number of cows be x and the number of hens be y.   Then, 4x + 2y = 2 (x + y) + 14 4x + 2y = 2x + 2y + 14 2x = 14 x = 7.   Answer: 7
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In a group of cows and hens, the number of legs are 14 more than twice the number of heads. The number of cows is