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Apel = x
Manggis = y
Maka, diperoleh persamaan :
x = 2y
2x +3y = 56.000
2x +3y = 56.000
2(2y) +3y = 56.000
4y +3y = 56.000
7y = 56.000
y = 56.000/7
y = 8.000
x = 2y
= 2(8.000)
= 16.000
Jadi, harga 1 kg Apel (x) adalah Rp 16.000,00.