Replace the question mark with the number below given a simple math problem.

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

What word begins and ends with an E, but has only one letter?

What do you think with the below Picture ?

Find the last number in the series below:

voN luJ yaM raM ---

Using eight eights and addition only, can you make 1000?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?