20. In the volleyball championship draw, team A was three places behind team B, team E outperformed B but fell behind D, team V outperformed team G. What place did each of these six teams take?
$\triangle$ Consider the $7 \times 7$ table.

According to the first condition, team A could not have taken the first, second, or third place. Therefore, it took the fourth, fifth, or sixth place. Then team B took the first, second, or third place.

Since team B not only fell behind team E but also team D, it could only have taken the third place. Then team E took the second place, and team D took the first place. Since team A fell behind team B by three places, it took the sixth place. The remaining teams are B and G, and the fourth and fifth places. Since team B outperformed team G, it took the fourth place, and team G took the fifth place.

Answer: The teams, starting from the first place, are arranged in the order D, E, B, V, G, A.