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Harga ayam betina = X
Harga ayam jantan = Y
Harga itik jantan = Z
Persamaan 1
5X = 4Y
Persamaan 2
3Y = 4Z
Diketahui
Harga itik jantan (Z) = Rp75.000,00
Ditanyakan = Harga dua ayam betina = 2X
Jawab =
Harga ayam jantan
3Y = 4Z
3Y = 4 · Rp75.000,00
Y = 4 · Rp75.000,00/3
Y = Rp100.000,00
Harga ayam betina
5X = 4Y
5X = 4 · Rp100.000,00
X = 4 · Rp100.000,00/5
X = Rp80.000,00
Harga 2 ayam betina
2X = ?
2X = 2 · Rp80.000,00
2X = Rp160.000,00 (D)