What always comes into a house through the keyhole?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?

Before Mount Everest was discovered, what was the highest mountain in the world?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.