What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

If a wheel has 54 spokes, how many spaces are there between the spokes?

Spot what is wrong here in below Picture?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?