Is it possible for the "big bet"

[Frankjenny]

For example. Instead of say 10-20 hold-em, could it be 10-25, where in the first 2 betting rounds, the big blind is 10, and all calls are 10 and raises are 10 +10. then on the Turn and the River, the opening bet is 25 and all calls are 25, and raises are 25 +25, or must it be exactly double the small bet?

[wunderlich]

Frankjenny, usually those bets are double sized. But i have encountered 10-25 patterns in a few sites while playing online. So it will be ok to make those bets 25.