A man has some hens and cows. If the number of heads be 60 and the number of feet equals 200, then the number of hens will be:  Answers.
A) 22  B) 25  C) 24  D) 20  E) 28

Rationale: "explanation : let the number of hens be x and the number of cows be y . then , x + y = 60 . . . . ( i ) and 2 x + 4 y = 200 x + 2 y = 100 . . . . ( ii ) solving ( i ) and ( ii ) we get : x = 20 , y = 40 . the required answer = 20 . answer : d"
Answer: D