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34.
rata2 A: 72
rata2 B: 80
jumlah nilai B: 80*15=1200
rata AB: 75
jumlah nilai AB: (15+x)*75=1200+72x
1125+75x=1200+72x
75x-72x=1200-1125
3x=75
x=25
jumlah siswa kelas A adalah 25