I am a seven-letter word but if you remove four of my letters I will have one left. What word 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.

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

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

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

What month of the year has 28 days?

The more you take me, the more you leave me behind.
Who Am I?