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Verified answer
Rata-rata = (6 + 8 + x + y + 9) : 58 = (23 + x + y) : 5
23 + x + y = 5 x 8
23 + x + y = 40
x + y = 40 - 23
x + y = 17
rata-rata x dan y = (x + y) : 2
= 17 : 2
= 8,5