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35
35*6,8 = 210 + 5x
238 = 210 +5x
238-210 = 5x
28 = 5x
28:5=x
5,6 = x (d)
jmlh nilai 35 siswa = 35 × 6.8 = 238
238-210 = 28
28 : 5 = 5.6