How many times can you subtract the number two from the number fifty?

How can a man go eight days without sleep?

If you say my name, I will no longer exist. What am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

What is the longest word in the dictionary?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

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?