If you didn’t focus on mathematics today, you should at least keep the gears in motion by trying to solve this mathematical puzzle.
You are blindfolded, then given a deck of cards in which 23 of the cards have been flipped up, then inserted into the deck randomly (you know this). Without taking the blindfold off, rearrange the deck into two stacks such that both stacks have the same number of up-flipped cards. (You are allowed to flip as many cards as you please).
What’s your solution?