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

which number am I?

What is so fragile that saying its name breaks it?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

No matter how little or how much you use me, you change me every month. What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?