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4*6=24
5*3=15
6*12=72
7*14=98
8*10=80
9*5=45
jumlahkan semua = 344
banyak siswa 50
334:50=6,68
30.a
p=3
5*4=20
6*3=18
7*14=98
8*12=96
9*2=18
jumlah semua 250 dibagi nilai (35)= 7,1428571429