A man has some hens and cows. If the number of heads be 48 and the number of feet equals 140, then the number of hens will be:  Choose the correct choice from the following answers:
A) 22 B) 23 C) 24 D) 26 E) 27
EXPLANATION   Let the number of hens be x and the number of cows be y.   Then, x + y = 48 …. (i)   and 2x + 4y = 140 x + 2y = 70 …. (ii)   Solving (i) and (ii) we get: x = 26, y = 22.   The required answer = 26.   Answer 26
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A man has some hens and cows. If the number of heads be 48 and the number of feet equals 140, then the number of hens will be: