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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

5
7
10
12

Correct Answer: 7

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.

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