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

Who am I?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

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

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

A girl says this to her best friend: “I was born in 1955, and I celebrated my 17th birthday last weekend.” Her best friend thinks she’s lying, but she’s actually correct. How is that possible?

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

How many letters are in the alphabet?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

How is the moon similar to a dollar?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?