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Verified answer
Misalkan siswa putri = xsiswa putra = y
x + y = 20
x = 20 - y
80x + 70y = 74,5 × 20
80x + 70y =1490
80(20 - y) + 70y = 1490
1600 - 80y + 70y = 1490
-10y = 1490 - 1600
-10y = - 110
y = 11
x = 20 - 11 = 9
jadi siswa putra = 11 orang