How many bananas can you eat if your stomach is empty?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

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

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

What has a bottom at the top?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

If eleven plus two equals one, what does nine plus five equal?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

What am I?