utets13 q107

107In a farm, there are some hens and goats. The sum of their heads are 77 and sum of their legs are 248. The number of hens in the farm are

Option : B
Explanation : Let the number of hens and goats be x and y, respectively.
x + y = 77 .......(i)
and 2x + 4y = 248 ........(ii)
Solving the above two equations, we get
y = 47
and x = 30

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