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y = jeruk (kg)
3x+y= 25.500,00 | x 2|------> 6x+2y= 50.500,00
4x+2y= 42.000,00 | x 1|------> 4x+2y= 42.000,00
______________ _
2x= 8.500,00
x= 8.500,00/2
x= 4. 250
Jadi, harga 1 kg mangga adalah Rp 4.250,00