Question

# There is a group of cows and chickens. The number of legs was 14 more than twice the number of heads. The number of cows is A. 5 B. 8C. 7 D. 4

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Hint: The cows have four legs each, while the chickens have two. Assume there are x number of cows and y number of chickens. Now, with the help of the given data form an equation and solve for the value of x.

∴ total number of heads is $x + y$
Therefore, total number of legs is $4x + 2y$
$4x + 2y = 2(x + y) + 14 \\ \Rightarrow 4x + 2y = 2x + 2y + 14 \\ \Rightarrow 2x = 14 \\ \Rightarrow x = 7 \\$