Respuesta :

according the the details of the question, 

49=2x+10 +4x-15
49+15=2x+4x+10
64=6x+10
64-10=6x
6x=54
x=54/6
x=9

so angle BOC= 2(9)+10
=18+10
=28

from this we can see the answer is the third option