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a+k=40...............(1)
a=40-k.................(3)
» kaki ayam ada dua,
» kambing ada 4
maka
2a+4k=112.................(2)
subtitusi persamaan 3 ke persamaan 2,
2(40-k)+4k=112
80-2k+4k=112
80+2k=112
2k=32
k=16
a+k=40
a+16=40
a=40-16
a=24 ekor