A rectangular vegetable field is surrounded by a 72-meter-long fence, and the ratio of length to width is required to be 2:1. What is the area of this vegetable field in square meters?
用72米长的篱笆围成一个长方形菜地，要求长与宽的比是2：1，这块菜地的面积是多少平方米？
<result>228</result>