What does this mathematical rebus means ?

Decode this picture on T-Shirt and tell what it says ?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

I travel all around the world but always stay in the corner. What am I?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

Can you fill the blank with the correct number?

6 30 870 756030 _____

The King of a distant land had heard that Birbal was one of the wisest men in the East and so desired to meet Birbal. He sent Birbal an invitation to visit his country.

In due course, Birbal arrived in the distant kingdom. When he entered the palace he was flabbergasted to find not one but six kings seated there. All looked alike. All were dressed in kingly robes. Who was the real king?

The very next moment he got his answer. Confidently, he approached the king and bowed to him.

How did Birbal know who was the real king?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.