The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Buy me, smell me or deliver me, I do not change.

Who am I?

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

What Does this text mean:

important=important

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

What goes up but never comes down?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

Find the next number in the series.
1 10 24 43 67 ?