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

Why is the Hole below a Lock?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

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

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

What has lots of eyes, but can’t see?

I am quite hot but become too cold if you remove the first two letters. What am I?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?