Can you place six X (crosses) in below board without making three in a row in any way ?

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?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

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

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

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

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

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

Identify the 10 differences between the two given pictures.

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?