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64 = ( 65 . 18 ) + ( n2 . 2) / 18 + 2
64 = 1170 + 2n2 / 20
64 . 20 = 1170 + 2n2
1280 = 1170 + 2n2
1280 - 1170 = 2n2
110 = 2n2
110 / 2 = n2
55 = n2
18x65=1170
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2x = 110
x=110/2=55 nilai rata rata yg remed 55