besar BOC tolong bantu ya...

Besar AOD + Besar COD = 180 
(3x-5)+(2x+10) = 180
5x+5=180
x=175/5
x= 35
Maka Besar BOC
= 2x+10 = 90
= 2 x (35) = 80
= 70 = 80
sehingga besar BOC = 80-70 = 10 derajat 
Jawab = D