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1110 + 5x / 20 = 72
1110 + 5x = 1440
5x = 1440 - 1110
5x = 330
x = 330 / 5
x = 66
nilai rata2 15 sisw = 74
nili rta2 tmbhn 5 siswa = 72
maka :
> jumlh nilai rata 15 siswa = 74 x 15 = 1.110
> jumlh nilai rata 20 siswa = 72 x 20 = 1.440
jd nilai rata2 5 siswa = (1440-1110)/5 = 66