Find The Odd One Out

1. FLOW
2. SNIP
3. TRAP
4. DRAW
5. BACK

Solve the following series:
AZ, GT, MN, __, YB

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Find the next number in the series below.

6 18 270 72090 ?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

What is the next number?

77, 49, 36, 18 ?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?