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

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

What runs around the whole yard without moving?

John was drowned by he was not wet. How?

What does this below rebus puzzle mean?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

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?