Can you make four (4) nines (9) equal 100?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

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?

Decode below rebus
D
N
A
T
S , D

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Whats the next number in the below number sequence pattern.

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

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