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Verified answer
Jumlah berat 20 semangka = 20 x 7,8= 156 kg
Terjual 8 buah, 12 semangka rata-ratanya naik 2 kg
maka rata-rata tersisa = 9,8 kg
Jumlah berat 12 semangka = 12 x 9,8
= 117,6 kg
Sehingga :
Berat 8 semangka = 156 - 117,6
= 38,4 kg
Rata-rata berat 8 semangka = 38,4/8
= 4,8 kg
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