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

Buy me, smell me or deliver me, I do not change.

Who am I?

Find out the missing number in the picture attached:

If a wheel has 54 spokes, how many spaces are there between the spokes?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

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?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

What jumps when it walks and sits when it stands?

What begins with T, ends with T, and has T in it?

In the four images below, can you find the odd one out?