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rata-rata nilai matematika= (nilai santi + 4 orang teman ) + nilai andi / 6 siswa
7,2 = 35 + nilai andi / 6 siswa
35 + nilai andi = 7,2 x 6 siswa
35 + nilai andi = 43,2
nilai andi = 43,2 - 35
= 8,2