What's the only room from which no one can enter or leave

What will you call your mother's brother's brother-in-law?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Take one out and scratch my head, I am now black but once was red. What am I?

If 1+9+8=1, what is 2+8+9?

I have Rs.50 and I spend it in the way as below.

There is a basket full of hats. Three are white and two are black. Three men, Tom, Tim, and Jim, each take a hat out of the basket and put it on their heads without seeing the hat they selected or the hats the other men selected. The men arrange themselves so Tom can see Tim and Jim’s hats, Tim can see Jim’s hat, and Jim can’t see anyone’s hat. Tom is asked what color his hat is and he says he doesn’t know. Tim is asked the same question, and he also doesn’t know. Finally, Jim is asked the question, and he does know. What colour is his hat?