If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

What number do you get when you multiply all of the numbers on a telephone's number pad?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

You need to remove two matchsticks to make the below equation true. Can you do it ?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

What four weights can be used to balance from 1 to 30 pounds?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

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

which number am I?