September 2018 2 25 Report
Rata-rata nilai kelas 9A adalh 72 .Rata-rata nilai 15 siswa kelas 9B adalh 80.Jika nilai siswa kelas 9Adan 9B digabungkan rata-ratanya menjadi 75.Bnyak siswa kelas 9A adalah...
a.15
b.20
c.25
d.40

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