What does this mathematical rebus means ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

How can you leave a room with two legs and return with six legs?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

What two things can you never eat for breakfast?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

What came first, the chicken or the egg?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?