I am an odd number. Take away a letter and I become even. What number am I?

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

You need to remove four matchsticks from the picture below and still need to maintain the following as in the original image.
1. 1st row contains 12 matchsticks
2. 2nd row contains 12 matchsticks
3. 1st column contains 12 matchsticks
4. 2nd column contains 12 matchsticks

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

What month of the year has 28 days?

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

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.