There is an interesting topic in the thirteen volumes of Cheng Dawei, a mathematician in the Ming Dynasty. The topic appears in the form of poetry.

Solution: There are X bottles of good wine and Y bottles of thin wine.

x+y= 19

3x+y/3=33

X= 10 and y=9 are obtained by solving the above binary linear equation.

Answer: 9 bottles of good wine 10 and thin wine.