Common Situation

[David Sklansky]

10-20 Holdem. Capped pot is about $200 preflop. Flop is 222 or thereabouts. Player to your right bets with what you are sure is an overpair, probably high. Players to your left don't figure to have pocket pairs and will fold to a raise. You have pocket tens. Approximately how high must your chances be of having the best hand to make it correct to raise if you think you will usually be reraised?