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

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

What is next number in the pattern below:

131 517 192 123 ?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Can you find the dog hidden in a group of pandas?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Find the next number in the following series:
6, 14, 26, 98, __?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

If 21x = 79x, what is the value of x?