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nilai rata2 40 siswa = 70
nilai rata2 30 siswa = 72
maka :
Jumlh nilai 40 siswa = 70 x 40 = 2.800
Jumlh nilai 30 siswa = 72 x 30 = 2.160
Nilai rata2 10 siswa = (2.800-2.160)/10 = 64
30x72 = 2160
2800 - 2160 = 640
640/10 = 64