一次数学课堂上,需要解决这样一道练习题:某小卖部出售矿泉水并回收空瓶,约定:每3个空瓶可以换一瓶矿泉水．某几位同学买了10瓶矿泉水,那么他们最多可以喝到多少瓶矿泉水?同学们经过分析,比较轻松地得出答案:共可喝到14瓶矿泉水,余两个空瓶．理解为: 10个空瓶→3瓶矿泉水+1个空瓶→4个空瓶→1瓶汽水+1个空瓶→2个空瓶． In a mathematics class, it is necessary to solve such an exercise problem: a small store sells mineral water and recycles empty bottles. It is agreed that every three empty bottles can be exchanged for a bottle of mineral water. Some classmates bought 10 bottles of mineral water, so how many bottles of mineral water can they drink? After analysis, the students can easily find the answer: There are altogether 14 bottles of mineral water and two empty bottles. Understand: 10 empty bottles → 3 bottles of mineral water + 1 empty bottle → 4 empty bottles → 1 bottle of soft drinks + 1 empty bottle → 2 empty bottles.