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210 + 5x = 269,5
5x = 59,5
x = 11,9
nilai rata-rata 5 orang 11,5
30 orang rata-rata 7 = 30.7 = 210
35 orang rata-rata 7,7 = 35.7,7 =269,5
Jadi kalau rata-rata 5 orang= 269,5-210
= 59,5