I am quite hot but become too cold if you remove the first two letters. What am I?

The centre of the third figure is empty. What digit should fit inside?

What can you serve, but never eat?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

John was piloting a plane behind a car but was never able to overtake it. Why?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Can you make four (4) nines (9) equal 100?

Prove that twice of ten is the same as twice of eleven.

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?