17. 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:
a. 22
b. 23
c. 24
d. 26
Answer: Option d
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.
Therefore, The required answer = 26.
