A man has some hens and cows. If the number of heads be 42 and the number of feet equals 124, then the number of hens will be  Pick one
A) 22
B) 24
C) 26
D) 20
E) 28
Explanation :   Let number of hens = h and number of cows = c   number of heads = 42   =&gt; h + c = 42 ---(Equation 1)   number of feet = 124   =&gt; 2h + 4c = 124   =&gt; h + 2c = 62 ---(Equation 2)   (Equation 2) - (Equation 1) gives   2c - c = 62 - 42   =&gt; c = 20   Substituting the value of c in Equation 1, we get   h + 22 = 42   =&gt; h = 42 - 20= 
<gadget id="calculator">42 - 20</gadget>
<output>22</output>
22   i.e., number of hens= 22   22nswer : 22
<result>A</result>
A man has some hens and cows. If the number of heads be 42 and the number of feet equals 124, then the number of hens will be