Why Aeroplane windows are round?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

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?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

How many triangles are there on the puzzle below?

What's a single-digit number with no value?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

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

Can you guess the name of the month by looking the below rebus ?

Solve below popular number sequence
314 159 265 358 979 323 846 ?