five will get you ten

Betting parlance for even odds, i.e. betting five pounds (dollars, etc.) should win you ten.

• "Five will get you ten that your sheet will have an editorial on the Orchard case Sunday, and what will it say?"
• "Five will get you ten that he's either gone or dead by midnight Sunday."
• "She has a nice strong tone that falters just a bit in the upper ranges; five'll get you ten that problem clears up as soon as [she] gets completely comfortable with performing publicly."
• "As it is I'm going to be in big trouble financially if I lose my job and five will get you ten the bastards will try to drum me out."

• ten will get you twenty