<human>:  A certain school bought 10 cases of bottled water for their athletes. There are 20 bottles in each case. Seventy bottles of water were used during the first game. After the second game, only 20 bottles of water were left. How many bottles of water were used during the second game?
<bot>: How many bottles of water did the school buy? ** The school bought 10 x 20 = <<10*20=200>>200 bottled water.
How many bottles of water were left after the first game? ** There were 200 - 70 = <<200-70=130>>130 bottled water left after the first game.
How many bottles of water were used during the second game? ** So, there were 130 - 20 = <<130-20=110>>110 bottled water used during the second game.
#### 110