tolong dong please.....

180=100+4b+2b+20
60 =6b
b=10
AEB=2×10+20=40°

4b + 100 + 2b + 20 = 180
6b + 120 = 180
6b = 180-120
6b = 60
  b = 60/6
  b = 10

aeb = 2b + 20
       = 2(10)+20
       = 20+20
       = 40°