It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

It belongs to you, but other people use it more than you do. What is it?

What word does this rebus represent?

meta meta
meta meta

Can you place three balls such that the equation shown in the picture holds true?