Q54
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
A.
5
B.
7
AnswerC.
10
D.
12
Answer: Option B
Solution
Answer: Option B
Solution:
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.