The available budget is different for every project; it depends on the needs of the client and the type of request in the brief.
As a result of this, the number of awards vary from project to project. There may be only one winner, or there may be many; and consequently the amount winning content will vary.
You can consult the "awards" tab on the project brief page to check the specifics about the awards placements, how it will be divided, and the number of winners that will be selected. The total awards pool is always visible on the projects home page in the box with the project title.