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2L = P + 28
L = P+28 /2
JUMLAH = P+L
80= P +( P + 28 /2)
80 +P=P+28 /2
SAMA SAMA KALI 2
160 + 2P = P + 28
3P = 132
P=44
MAKA L = 80 - 44 = 36
PEREMPUAN = 44
LAKI-LAKI=36
40-28
=12
kesimpulan ; jadi banyak siswa lk dan pr adalah 12