#22 Brain Power

I'd pick the silver box, each box has a statement exactly one is true. These are the labels:
Gold box label: "The prize is in this box."
Lead box label: "The prize is not in the gold box."
Silver box label: "The prize is not in this box.”

If you can only have one true statement, then if the gold label is true, then the sliver label would also be true because the prize would be in the gold box not the silver box. So nope not in the gold box. 

If the prize is in the lead box, which states that the prize is not in the gold box, so that's true because it's in the lead box, but once again the silver box statement would be true, because it is not in the silver box....... 

But the silver box actually has the prize and there would be only one true statement, Gold label:  "The prize is in this box." FALSE its in the silver box, Lead box "The prize is not in the gold box" This is TRUE, and for the silver label statement it would be FALSE because "The prize is not in this box," but it is!!!!!