Solve this riddle by finding the odd one out from the rest.

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What is the word or phrase?

A generous owner of a company decided to give a bonus of $45 to every man and $60 to every woman on his birthday. But only one-ninth of the men and one-twelfth of the women were present to take the bonus.

Can you calculate the amount of money the owner spent if there were 3552 employees?

A sundial has the fewest moving parts of any timepiece. Which has the most?

How far can you walk into the woods?

What is the coolest letter in the alphabet?