What goes up but never comes down?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Guess the hidden movie name?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

How many sides does a circle have?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can it be possible to build a house that has all its four walls facing towards the South?