Question

( 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 )

# 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

Solution