Why do you find that most of the buildings are deprived of the 13th floor?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

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?

Solve the mathematical equation in the picture below.

Can you solve the below geography rebus by decoding the below rebus ?

How can you tell a raw egg from a hard-boiled egg?

Can you count the number of squares in the given picture?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

In an office's desk, you find a unique method that shows the current day of the month. Two numbered cubes are used to depict the current date.

Can you find out the numbers on both the cubes so that each date can be mentioned using them?

Please note that you have to use both the cubes to display any date. Thus the 1st day must be represented by 01 and so on.

What brings you down but never up?