Can you name some countries which do not have the alphabet 'A' in them?

Considering the below equation:

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

Then, I + II + III = ?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What does this rebus mean?

O
N
C
E
TIME

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?