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Consider the hen be x and cow be y all the hen and cows have only one head then x+y=48 named as equation 1 hen have 2 feet and the cow have 4 feet then 2x+4y=140 named as equation 2 solve 1 and 2nd equation 2nd equ as 2x+4y=140 1st equ multiply as 2 then 2x+2y=96 subtract 2 equ -------------- 2y=44 y=22 (cow = 22) then x+y=48 x+22=48 then x=24 (hen = 24)