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x + y = 27 |x20.000|
=> 30.000x + 20.000y = 640.000
20.000x + 20.000y = 540.000 -
10.000x = 100.000
x = 10
x + y = 27
y = 27 - x
y = 27 -10
y = 17
Jadi, orang dewasa = 10 dan anak-anak = 17