What goes up but never comes down?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Can you count the number of blocks in the picture below?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

Our product and our sum always give the same answer. Who are we?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

Which point will the car reach to go out?

Can you count the number of lines in the below picture?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?