Answer:
OBC= 15
OCR =30
In OBQ
OBQ + QOB + OQB = 180
OBQ= OBC=15
OQB= 90
SO, QOB = 180- OBQ- OQB
= 180-15 -90
= 75
c) is correct
3(a+9/12)=3(a+7/12)+ (?)
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Answer:
OBC= 15
OCR =30
In OBQ
OBQ + QOB + OQB = 180
OBQ= OBC=15
OQB= 90
SO, QOB = 180- OBQ- OQB
= 180-15 -90
= 75
c) is correct