What does this rebus riddle means ?

Where do fish keep their money?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

What can you hold in your right hand, but never in your left hand?

What do you answer even though it never asks you questions?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What number do you get when you multiply all of the numbers on a telephone's number pad?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?