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85P + 85L = 88P + 83L
2L = 3P
P + L = 40
2P + 2L = 80
substitusi 2L = 3P
2P + 3P = 80
5P = 80
P = 16
jadi banyak siswa putri adalah 16 orang
l = 83
rk = 85
maka banyak laki2
= 88-85 = 3x
perempuan
= 85-83 = 2x
laki2 = 3/5 x 40 = 24
perempuan = 40-24 =16/D