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55 = 1890 + n/36
1980 = 1890 + n
1980 - 1890 = n
90 = n
nilai andi = 90
36 siswa -> 55
35*54 = 1890
1890 + x /36 =55
1890 + x = 55*36
1890 + x = 1980
x = 1980-1890
x = 90
jadi nilai andi 90