[DonCologne]

[ QUOTE ]
I don't think it's bad, you probably need to bet to win. Am I right in thinking if he folds 40% of the time this play is +EV?

[/ QUOTE ]

Hero invest here 17$ to win 55$. His EV is:

x*55$ - (1-x)*17$ with x the time villain folds and 1-x the time villain calls.

Hero plays +-EV:

x*55$ - (1-x)*17$ = 0
x*(55$+17$) = 17$
x = 17$/(55$+17$) = 23,61%

So villain must fold at least in 23,61% of the time, to make this bet +EV.