In a group of cows and hens, the number of legs are 16 more than twice the number of heads. The number of cows is : Choose the correct choice:
A) 5 B) 6 C) 7 D) 8 E) 12
Let no of cows be x, no of hens be y.   So heads=x+y   Legs=4x+2y   Now, 4x+2y = 2(x+y)+ 16   2x = 16   x = 8.   ANSWER:8
<result>D</result>
In a group of cows and hens, the number of legs are 16 more than twice the number of heads. The number of cows is :