Which word does the below Plexor means ?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

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

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

What has many teeth, but cannot bite?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you quickly find which two matchstick figures are identical?