What do you answer even though it never asks you questions?

Considering the below equation:

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

Then, I + II + III = ?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What does this rebus means ?

What four weights can be used to balance from 1 to 30 pounds?

Replace the question mark in the picture below.

What can you hold in your right hand, but never in your left hand?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.