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: Choose the correct choice
A) 22  B) 25  C) 24  D) 20  E) 28
Explanation:   Let the number of hens be x and the number of cows be y.   Then, x + y = 60 .... (i)   and 2x + 4y = 200 x + 2y = 100 .... (ii)   Solving (i) and (ii) we get: x = 20, y = 40.   The required answer = 20.   Answer: 20
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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: