Puzzles

I started collecting these puzzles because I liked solving them and I got tired of “Puzzles” books that have 43 versions of the same puzzles, like, “Mary is six years older than her sister Beth, who is half the age of . . .” Those get boring very quickly. The puzzles below are hopefully just beyond what you’re easily able to do. Let me know if you have more of the same kind.

• The Balance
• Train Doppler
• Picture Board
• Dominoes on a Checkerboard
• Three Daughters
• The Birthday Paradox
• Distance to the Horizon
• Two Marbles
• Airplane Seating
• Female Fraction

Some of these I made up, some I give credit for, and most I don’t know the origins of. If you know, please tell me.