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15 x 53 = 795
795 - 550 = 245
245/5 = 49
jadi nilai rata-rata kelima siswa tersebut adalah 49
53 x 15 = 550 + 5n
795 = 550 + 5n
795 - 550 = 5n
245 = 5n
= n
49 = n
jadi rata - rata dari 5 siswa adalah 49