Complete the table series riddle by finding the number that can replace "??".

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

With the help clues provided in the image, can you find the 5 digit key?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

How many sides does a circle have?