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Simplification - General Aptitude

Q1:

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

ANS:D - 26

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.