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p+w=40
w=40-p
7p+6,2w=6,5(p+w)
7p+6,2(40-p)=6,5(40)
7p+248-6,2p=260
0,8p=260-248
p=12/0,8
p=15 siswa
w=40-p
w=40-15
w=25 siswa
Selisih Pria dan Wanita =25-15=10 siswa