In a group of ducks and cows, the total number of legs are 36 more than twice the number of heads. Find the total number of cows. Options:
A) 12  B) 14  C) 16  D) 18  E) 20
Let the number of ducks be d   and number of cows be c   Then, total number of legs = 2d + 4c = 2(d + 2c)   total number of heads = c + d   Given that total number of legs are 36 more than twice the number of heads   =&gt; 2(d + 2c) = 36 + 2(c + d)   =&gt; d + 2c = 18 + c + d   =&gt; 2c = 18 + c   =&gt; c = 18   i.e., total number of cows = 18   Answer is 18.
<result>D</result>
In a group of ducks and cows, the total number of legs are 36 more than twice the number of heads. Find the total number of cows.