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perbandingan W:P = 3:1
maka pria=1/4 * 80 = 20
jadi siswa laki" yg ikut ada 20 anak
w = 3p
40.000w + 40.000p = 3.200.000...dibagi 10.000 supaya enak dihitung
4 w + 4p = 320
4(3p) + 4p = 320
12p + 4p = 320
16P = 320
P = 20
jadi Jumlah pria 20 Orang