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Siswa laki-laki = L
maka siswa perempuan = A - L
79 x L + 85 (A - L) = 83 A
79L + 85 A - 85L = 83A
79L - 85L = 83A - 85A
-6L = -2A
L = -2A/-6
L = 1/3 A
Perempuan = A - L = A - 1/3 A = 2/3 A
Perbandingan laki-laki : perempuan = 1/3 A : 2/3 A = 1 : 2