what's the probability of getting a king or a queen from a pack of 52 cards?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

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

What does the below mathematical rebus mean?

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

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?

Replace the question mark with the correct number in below Picture:

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?