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rata-rata siswa putra = 60
rata-rata siswa putri = 56
jumlah siswa = 40
misal, jumlah siswa laki-laki = a
maka,
(a)(60) + (40-a)(56) / 40 = 57,6
60a + 2240 - 56a / 40 = 57,6
4a + 2240 = 2304
4a = 2304 - 2240
4a = 64
a = 64 / 4
a = 16 orang
jumlah siswa putri = 40 - 16 = 24 orang
perbandingan putra dan putri :
16 : 24
dibagi 8
2 : 3