Before Mount Everest was discovered, what was the highest mountain in the world?

What have one eye but still cannot see?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

What breaks yet never falls, and what falls yet never breaks?

What you cannot hold but it is yours?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?