A man has some hens and cows. If the number of heads be 48 and the number of feet equals 136, then the number of hens will be: Choose the correct choice from the following answers
A) 22  B) 23  C) 24  D) 26  E) 28

Rationale: "let hens be x and cows be y now , feet : x * 2 + y * 4 = 136 heads : x * 1 + y * 1 = 48 implies , 2 x + 4 y = 136 and x + y = 48 solving these two equations , we get x = 28 and y = 20 therefore , hens are 28 . answer : e"
Answer: E