Let x be the number of chickens; y be the number of goats.
x+y=36. number of heads
2x+2y=72. from eq 1 multiplied by 2
-2y=-30. divide by -2
y=15. so may 15 goats
substitute from equation
x+15=36. get x by APE
note: 2x dahil may dalawang paa ang chicken at 4y dahil apat ang paa ng goat.
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