Which alphabet letter is a question?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?

What does below pictogram mean?

What is the next number in this matchsticks series riddle?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?