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

which number am I?

Find out the missing number in the picture attached:

Complete the table series riddle by finding the number that can replace "??".

What does below chemistry rebus means?

Find the missing number in the sequence below:

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

Remove two matchsticks to make the below equation correct.

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91