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A : Ayam
K + A = 40
K = 40 - A
4K + 2A = 112
4(40-A) +2A = 112
160 - 4A + 2A = 112
-2A = 112-160
-2A = -48
A = -48 / -2 = 24
banyak ayam = 24 ekor
2a + 4k =112 dikali 1 menjadi 2a + 4k = 112 (2)
pers (1) -(2) menjadi 2a = 48 jadi a = 24
jadi jumlah ayam di kandang = 24 ekor