In a soccer league with 5 teams, each team plays 20 games (that is, 5 games with each of the other 4 teams). For each team, every game ends in a win (W), a loss (L), or a tie (T). The numbers of wins, losses and ties for each team at the end of the season are shown in the table. Determine the values of x, y and z.
Team | W | L | T A | 2 | 15 | 3 B | 7 | 9 | 4 C | 6 | 12 | 2 D | 10 | 8 | 2 E | x | y | z
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