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Angle COD and angle EOI are equal angles (opposite interior angles) 
So, Angle COD = angle EOI = 5y
AB is a straight line, So central angle = 180 degrees
angle COB+angle DOA+angle COD = 180 degrees
12y = 180
y = 180/5
y = 15 degrees

2 5 2
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Angle EOF = angle COD=5y( V.O.A ) Also, Angle AOD= Angle BOE=2y( V.O.A. ) Angle BOC= Angle AOF= 5y ( V.O.A. ) 5y+5y+5y+5y+2y+2y=360 ( sum of angles on a point is 360° ), Therefore, 24y=360° y=360°/24=15 y=15