You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you write down eight eights so that they add up to one thousand?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

If eleven plus two equals one, what does nine plus five equal?

Can you solve this picture maths equation?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

How many letters are in the alphabet?