David's father has three sons: Snap, Crackle, and _____?

Theory #1: If Person A gives Person B 2 apples => The number of apples of person A is the same as person B's / Theory #2: If Person B gives person A 2 apples => The number of apples of person B is half of person A's

The more you take, the more you leave behind. What am I?

How does a dog cross a river without getting wet?

A has 5 apples. A decide to give B 3 apples. B then have 3 apples from A. But then A decide to take the apples that A gave B before. What did B lose?

What has a ring but no finger?

Which animal name start with letter "Y"?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What can you catch but never throw?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?