bantu yaaaaaaaaaaaa plis

Kelas 9 Matematika
Bab Statistika

78 . a + 10 . 85 = (a + 10) . 80
78a + 850 = 80a + 800
850 - 800 = 80a - 78a
50 = 2a
a = 50/2
a = 25 siswa

smoga membantush_!

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