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

which number am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Can you divide the below-given shape into four equal and identical pieces?

What country can make you shiver?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Can you find a five letter word that is left with only two letters if one is removed?