What does below rebus means ?

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?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

What is the longest word in the dictionary?

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?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?