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total nilai 7 anak=7,6 x 7 = 53,2
maka nilai rini
53,2 - 45 = 8,2
maka jika digabung dngan nilai rini,rataw mnjadi 7.6
7.6 = nilai 6 siswa + nilai rini / 6 + rini
7.6 = 45 + n.rini /7
7.6 x 7 = 45 + n.rini
53.2 = 45 + n.rini
n.rini = 53.2 - 45
n.rini = 8.2