A man has some hens and cows. If the number of heads be 50 and the number of feet equals 140, then the number of hens will be:	Choose the most appropriate option.
A) 22 B) 23 C) 24 D) 30 E) 28
let hens be x and cows be y   now,   feet: x*2+y*4=140   heads: x*1+y*1=50   implies, 2x+4y=140 and x+y=50   solving these two equations, we get x=30 and y=20   Therefore, hens are 26.   ANSWER:30
<result>D</result>
A man has some hens and cows. If the number of heads be 50 and the number of feet equals 140, then the number of hens will be: