What's the only room from which no one can enter or leave

What does this mathematical rebus means ?

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

When is the top of a mountain similar to a savings account?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Rihana, Peeta, and Logan order a pizza for $10. Out of the three, Rihana and Peeta were quite hungry and ate 6 slices a piece, while Logan had just 2 slices.

Now, they want to split the cost among them fairly but due to the lack of change, they decide to round off the cost to the nearest possible dollar.

Can you find out the fairway which should be used to split the money?

What if the pizza was worth $11?

What number do you get when you multiply all of the numbers on a telephone's number pad?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

What four weights can be used to balance from 1 to 30 pounds?

What time is it when an elephant sits on a fence?