There is a rectangular lawn whose length is 21.6 meters and is three times the width. What is the area of the lawn in square meters?
有一块长方形草地，长是21.6米，是宽的3倍，这块草地的面积是多少平方米？
<gadget id="calculator">21.6 / 3</gadget>
<output>7.2</output>

<gadget id="calculator">21.6 * 7.2</gadget>
<output>155.52</output>

<result>155.52</result>