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nilai rata2 15 ank = 74
nilai rata2 engn 5 tmbhn = 72
maka :
Jumlh nilai 15 anak = 15 x74 = 1.110
jumlh nilai 15+5 ank = 20 x 72 = 1.440
jadi nilai rata2 5 anak = (1.440-1110) / 5 = 330/5 = 66
1110 + 5x = 1440
5x = 1440-1110
5x = 330
x = 66
rata-rata ke 5 siswa tersebut = 66
~maaf kalau salah~