There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Buy me, smell me or deliver me, I do not change.

Who am I?

What is the relationship between these matchstick pictures below?

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

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

John was drowned by he was not wet. How?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

What does this rebus mean?

O
N
C
E
TIME

I add 5 to 9 and get 2. The answer is correct, so what am I?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?