Tolong jawab pertanyaan berikut

3.perempuan =10
laki2 = 3/2 x 10 =15
jumlah siswa = 10+15=25

4.1-(1/10+2/5+1/4)
= 1-(2/20+8/20+5/20)
= 1-15/20
= 20/20-15/20
=5/20
=1/4