Xiaoxiao went to the supermarket and bought some of the same cola and the same mineral water, and paid exactly 60 yuan. It is known that each bottle of cola is 4 yuan, and each bottle of mineral water is 3 yuan. Xiaopang has to buy both kinds of drinks. How many different kinds can there be at most? buying method.
笑笑去超市买了一些同样的可乐和同样的矿泉水，正好付了60元，已知每瓶可乐4元，每瓶矿泉水3元，小胖两种饮料都要买，最多有多少种不同的买法．
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