In a group of buffaloes and ducks, the number of legs are 24 more than twice the number of heads. What is the number of buffaloes in the group ?  Choose the correct answer.
A) 6
B) 10
C) 8
D) 12
E) 14
Explanation:   Let the number of buffaoes be x and number of ducks be y.   Then 4x + 2y = 2(x + y) + 24   =&gt; 2x = 24   =&gt; x = 12.   Answer: 12
<result>D</result>
In a group of buffaloes and ducks, the number of legs are 24 more than twice the number of heads. What is the number of buffaloes in the group ?