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ayam jantan = y
itik = z
4x = 3y.....1)
2y = 3z.....2)
z = 42.000
2y = 3(42.000)
2y = 126.000
y = 63.000
4x = 3y
4x = 3(63.000)
4x = 189.000
x = 47.000
3x = 3(47.000)
3x = 141.000
Jadi, harga 3 ekor ayam betina adalah Rp141.000