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

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

How many Watermelons are there in the below picture?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

Remove two matchsticks to make the below equation correct.

Can you convert the number zero(0) into a positive number using just one mathematical operator ?