Some people count sheep when they can’t get to sleep.

I create math puzzles when I wake up too early.

Here is my latest:

Alice is 10 years old and just got a newborn baby brother, Bob. Although he will always be ten years younger than she, there will be a point in time when Bob’s age is less than half of Alice’s age.

How old will Alice and Bob be when that milestone occurs? Continue reading “Alice + Bob = Calculus? (Just kidding!)”