A man has some hens and cows. If the number of heads be 100 and the number of feet equals 240, then the number of cows will be: Choose the correct choice from the following choices
A) 22 B) 23 C) 24 D) 20 E) 28
Explanation:   Let the number of hens be x and the number of cows be y.   Then, x + y = 100 .... (i)   and 2x + 4y = 240 x + 2y = 120 .... (ii)   Solving (i) and (ii) we get: x = 26, y = 20.   The required answer = 20.   Answer: 20
<result>D</result>
A man has some hens and cows. If the number of heads be 100 and the number of feet equals 240, then the number of cows will be: