190+135+220=445. 360(the degrees in a circle)/445(the number of students)=0.81. Each student is worth 0.81 degrees. 0.81x190(the number of students that like the program)=135.9. That rounds up or 136 so the answer is 136 degrees.
Supplementary angles sum up to 180°, suppose the supplement of 161° is x. Then 161+x=180 solving for x we subtract 161 from both sides 161-161+x=180-161 x=19 thus the supplement is 19°
