The pot of John and Tony

John and Tony have both $ 20556
- If John gives Tony amount "M" they will each have the
same amount.
- By cons, if Tony gives John the same amount "M" then,
John will be eight times more money than Tony.
- A/ How much is owned by John?
- B/ How much is owned by Tony?
- C/ How much is "M"
  (Writing as A,B,C)