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7,7 x 31 = 7,8 x 30 + x
x = 7,7 x 31 - 7,8 x 30
= 238,7-234
= 4,7
jadi nilai anton = 4,7
= 234
Nilai 31 siswa = 7,7 × 31
= 238,7
Nilai Anton = Nilai 31 siswa - Nilai 30 siswa
= 238,7 - 234
= 4,7