Spot the cat in the picture below

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

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

Do you know what I am?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

How can you make number one disappear by adding something to it?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

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

Count the number of balls in picture below:

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?