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1 permen = 20 gram
7 permen = 20 gram ×7 = 140 gram
Berat seluruh dus kue = (460-140) = 320
berat 1 dus kue = 320 ÷ 4 = 80 gram
460-140=320
320:4=80
Jadi berat setiap kotak kue adalah 80 gram