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Banyak pria = x
Maka Banyak wanita = 40 - x
Nilai rata-rata kelas = 73
Nilai total kelas = 73 * 40 = 2920
Nilai total kelas = 70x + 75(40-x)
70x + 3000 - 75x = 2920
70x - 75x = 2920 - 3000
-5x = -80
x = 16 (Jumlah siswa laki)
Jumlah siswa perempuan = 40 - x = 24
Jika kita kroscek kembali:
70 (nilai rata" siswa) * 16 (jumlah siswa) + 75 (nilai rata" siswi) * 24 (jumlah siswi) = 73 (nilai rata" kelas) * 40 (jumlah siswa kelas)
1120 + 1800 = 2920
2920 = 2920