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50.000a + 30.000b = 9000000
30.000a + 30.000b = 7.500.000
50.000a + 30.000b = 9.000.000
= 20.000a = 1500.000
a = 1500.000 : 20.000
a = 75
a + b = 250
75 + b = 250
b = 250 - 75
b = 175
jadi penonton kelas 1 ada 75 orang dan kelas 2 nya 175 orang