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

How does a dog cross a river without getting wet?

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

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

Which animal name start with letter "Y"?

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

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?

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?