If 21x = 79x, what is the value of x?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

How can you make a TV, a bed, a dog, and a car liquid?

What does this rebus mean?

O
N
C
E
TIME

Our product and our sum always give the same answer. Who are we?

Can you count the number of matches in the picture below ?

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

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?