In a group of cows and hens, the number of legs are 10 more than twice the number of heads. The number of cows is :
Choose the most appropriate option
A) 5 B) 6 C) 7 D) 10 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)+ 10   2x = 10   x = 5.   5NSWER:5
<result>A</result>
In a group of cows and hens, the number of legs are 10 more than twice the number of heads. The number of cows is :