In a group of ducks and cows, the total number of legs are 20 more than twice the no. of heads. Find the total no.of buffaloes.	Answers:
A) 10
B) 12
C) 13
D) 15
E) 16
Let the number of buffaloes be x and the number of ducks be y   =&gt; 4x + 2y = 2 (x + y) + 20   =&gt; 2x = 20 =&gt; x = 10   10
<result>A</result>
In a group of ducks and cows, the total number of legs are 20 more than twice the no. of heads. Find the total no.of buffaloes.