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n1 = 31
n2 = 1
×gab = 65
x1 = 64
xgab = n1 × x1 + n2 × x2 / n1 +n2
65 = 31 × 64 + 1 × x2 / 31 + 1
65 = 1984 + 1 × x2 / 32
1984 + 1 × x2 = 32 × 65
1 × x2 = 2080 - 1984
1 × x2 = 96
x2 = 96 /1
x2 = 96
jadi nilai ul mtk siswa tsb adalah 96