Your 20 euro breaks down as 10 on a win and 10 on a place.
The win bet is lost.
The place bet comes in at ¼ the odds.
33/1 at ¼ the odds = 8.25 times 10 euro.
The ew bet should gain you 82.50 + your original 10 = 92.50
Well done, you're a winner.