[Marc]

You'd get the money back at odds of 11/10 not the current as thats when you placed the bet.

And I think 8/11 is worse than 11/10 therefore Noirin would be favourite to be evicted.

You'd get £38 back if you bet 20 on marcus at 11/10 and
You'd get £34 back if you bet 20 on Noirin at 8/11.

You'd get more back on Marcus so therefore his odds are worse. You get less back from Noirin so therefore her odds are shorter and more favorable


(someone let me know if i'm completely wrong)