A rectangular piece of land is 4 times as long as it is wide, and its circumference is 120 meters. What is the area of this rectangle in square meters?
一块长方形地，长是宽的4倍，周长是120米．这个长方形的面积是多少平方米？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">120 / 2 / 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">48 * 12</gadget>
<output>576</output>

<result>576</result>