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Aula 2 : Aula 3 = 2 : 3 Kali silang
6 : 8 : 12
Aula 1 + aula 2 = 6 + 8 =14
Aula 2 = 8/14 x 420
= 240
Aula 3 = 12/8 x 240
= 360
jadi, banyak siswa di aula 3 adalah 360