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Verified answer
Rata-rata = (m + m + 2 + m + 5 + 2m - 2 + 2m) / 515 = (7m + 5) / 5
5 x 15 = 7m + 5
75 = 7m + 5
7m = 75 - 5
7m = 70
m = 70 / 7
m = 10
maka, umur anak termuda adalah 10 tahun