Questiu . In a farm there are cows ...
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Questiu . In a farm there are cows and hens. If heads are counted there are 180, if legs are counted there are 420. The number of cows in the farm is

JEE/Engineering Exams
Maths
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( N_{0} cdot theta / cos u=x ) No of hens ( =y ) ( x+y=130-0 ) ( 4 x+2 y=420 Rightarrow 2 x+y=210 ) (2) -0 ( x=30 ) ( Rightarrow y=180-x=150 ) ( operatorname{coses}=30 operatorname{sen} s=150 )
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