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aula 1 :aula 2 = 3:4
aula 2 :aula 3 = 2:3
maka aula 1 : aula 2 : aula 3 = 3 :4 : 6
jika aula 1 + 2 = 420 maka aula 3
6/7*420 [perbandingan] = 360