Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

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

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

Who has married many women but was never married?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

The centre of the third figure is empty. What digit should fit inside?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?