I have teeth but i don't bite. Who Am I ?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

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

I can write cow in 13 letters.

Can You?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Find the number of squares in the below-given picture.