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請幫忙計算
啤酒2元一瓶,
4個蓋可換一瓶,
2個空瓶換一瓶,
10元可以飲到幾多瓶?
答案:18瓶
元 | 飲 | 瓶 | 4蓋1瓶 | 2空瓶1瓶 | |
10 | 0 | 5 | |||
5 | 3 | 1 | 1 | ||
3 | 3 | 0 | 0 | ||
3 | 1 | 3 | 1 | ||
1 | 2 | 0 | 0 | ||
2 | 1 | 2 | 0 | ||
1 | 0 | 3 | 1 | ||
0 | 1 | 3 | 0 | (借1空瓶) | |
1 | 1 | 0 | 1 | ||
1 | 1 | 1 | 0 | ||
1 | 0 | 2 | 0 | 還1空瓶 | |
借空瓶 | 18 | ||||
不借空瓶 | 15 |
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