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70 . 40 = 1020 + 25x
2800-1020=25x
1780 = 25x
1780: 25 = x
71,2 = x
jafi rata rata siswa wanita adalah 71,2
keterangan (.)=tnda kali
Laki-laki = L
Perepuan = P
L + P = 40
15L + 25P / ( L +P) = 70
15*68 + 25P /(40) =70
1.020 + 25P = 2.800
25P = 2.800-1.020
25P =1.780
P = 1.780/25 = 71,2
Nilai rata perempuan = 71,2