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k = kambing
a + k = 12
2a + 4k = 40 (kaki ayam ada 2, kaki kambing ada 4)
a + k = 12
a = 12 - k
2a + 4k = 40
2(12 - k) + 4k = 40
24 - 2k + 4k = 40
2k = 40 - 24
2k = 16
k = 16/2
k = 8
Banyak kambing di ladang tersebut adalah 8 ekor
jumlah kaki mereka = 40
kambing : ayam = 4: 2
kambing = 4/6 × 12
= 8 ekor
ayam = 2/6 × 12
= 4 ekor