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

Do you know what I am?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Can you find out which options fits best with the missing column?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

Why do we preferably have round manhole covers and not square ones?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

How many times can you subtract the number 5 from 25?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What building has the most stories?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).