Can someone i’m not understanding this anymore. i thought i had it but i don’t

<DOC = <AOB =50* as opposite angles.

<DOE + <DOC + <EOA = 180*, thus <EOA = 180-50-60 =70*.

<COB + <AOB = 180*, thus <COB = 130*.

// Central angles equal the arcs they rely on.

Arc AE = <EOA = 70*.

Arc AB = <AOB = 50*.

Arc ECB = <EOD + <DOC + <COB = 60+50+130 = 240*.

Arc BOC = <COB = 130*.

2 over 5

step-by-step explanation:

the 2: 3 ratio is the length of the ac segment to the cb segment total length. this implies that the ratio between segment ac length and segment ab length is 2: 5. point c is 2/5 from a to b, so the required fraction is 2/5.