What is the longest word in the dictionary?

I am the fastest animal but cannot climb the tree. What am I?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?