What does this below rebus puzzle mean?

Can you find out the total number of triangles in the given figure?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Which city is three-fifths chick two third cat and 50% goat?

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

What is the next number in this series?

4,12,84,3612....

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

What does this rebus puzzle means ?