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? Think carefully first, then make a decision:
The school bought 10 x 20 = 200 bottled water. There were 200 - 70 = 130 bottled water left after the first game. So, there were 130 - 20 = 110 bottled water used during the second game. So, the answer is 110.