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

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

What type of tree can I carry in my hand?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Why are all black people so quick ?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?