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siswa putra = y
siswa putri = 40 - y
Nilai putra = 72×y = 72y
Nilai putri = 82×(40-y) = 3280 - 82y
Total nilai putra dan putri = 72y + 3280 - 82y = 3280 - 10y
Total siswa = y + 40 - y = 40
Rata2 Total = Nilai Total ÷ Total siswa
78.25 = (3280-10y) ÷ 40
78.25 × 40 = 3280 - 10y
3130 = 3280 - 10y
10y = 3280 - 3130 = 150
y = 150÷10 = 15
Jadi banyak siswa putra 15 orang