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Well, from a purely mathematical standpoint your friend would be correct based soley on pot odds. It would not be correct poker though.
If you have to call a 1/3 potsized bet, you are getting 4:1 on your money. If someone bets $30 into a $90 pot, as in your example, you have to call $30 into a now $120 pot, and you are getting exactly 4:1 pot odds.
On the turn, if you have seen 6 cards (4 on the board and 2 in your hand), and 4 are of the same suit, then the odds of making your flush on the river are 37:9 against.. very simple: 37 cards don't make your hand, 9 do. This is almost exactly 4:1 against.
You also have to factor in the fact that you may already have the best hand, especially if you paired one of your hole cards already. More importantly, you are going to have implied odds on the river if you do hit. How much obviously depends on your opponent, his cards, what he thinks your cards are, etc.
In practice, I've found that getting better then 3:1 here I would call with a nut flush draw. As most things with NLHE, it depends.
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