Tolong ya kak…Beserta caranya

1)
31 siswi
11 siswa
% siswa = 11/42 = x/100

2) IPA = 4/5 x 40 = 32menit

3) 14 botol = 84 detik
x botol = 120 detik

x = 120/84 x 14 = 20 botol