16) 80 -- 32%
x -- 100%
x = 80*100/32 = 250 учеников
17) 133 -- 14%
x -- 100%
x = 133*100/14 = 950 учеников
18) 105 -- 15%
x -- 100%
x = 105*100/15 = 700 учеников
19) 93 -- 31%
х -- 100%
х = 100*93/31 = 300 учеников
20) 171 -- 18%
х -- 100%
х = 171*100/18 = 950 учеников
21) 90 -- 36%
х -- 100%
х = 100*90/36 = 250 учеников