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cari berat sisa per berat keseluruhan :
x - ( 3/8x + 2/5x) = x - ((15 + 16)/40x) = x - 31/40x = 9/40x
cari berat awal :
berat sisa = 1728 kg
9/40x = 1728
x = 1728 . 40/9
x = 7680 kg
48 karung = 7680 kg
1 karung = 7680/48
1 karung = 160 kg