I did this but I'm not sure why.

PokerStars No-Limit Hold'em, $1.00 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($109.85)
Button ($98)
SB =#A500AF(Villian)/ ($79.85)
BB ($204.40)
UTG ($40.85)
UTG+1 ($119.50)
MP1 ($34)
Hero ($109.10)

Preflop: Hero is MP2 with Q, A.
3 folds, Hero raises to $3, CO calls $3, 1 fold, SB =#A500AF(Villian)/ calls $2.50, 1 fold.

Flop: ($10) K, 9, 5 (3 players)
Villian bets $3, Hero raises to $11


How often does villian fold TP here?
What is a good $ to raise to?

depends on the player...most standard players fold KQ,KJ here fearing AK.,your fold equity isnt high if he has AK... a calling station would probably call no matter what...any reads on the player...i like the raise as it is .3x the OR is fine...