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

Can you tell a 3D object that has just two surfaces?

How many times can you subtract the number 5 from 25?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

What month of the year has 28 days?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

What Does this text mean:

important=important

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

Why do we preferably have round manhole covers and not square ones?