Welcome to the secret bet page!  The answer is simple….you just add a line over the middle ‘1’ so that the equation becomes

IO TO 11 = 10.50

the puzzle is all about time, and the equation is now correct because ten to eleven is the same as 10.50!

And there are 101 other bets that you will win in my new book…..cleverly entitled ‘101 bets that you will always win‘.

All the best, Richard