Think about it: the length of a rectangular playground is three times its width, and Xiao Ming runs 800 meters along the playground for two weeks. How many square meters is the playground?
想一想：一个长方形的操场的长是宽的3倍，小明沿操场跑两周是800米．操场的面积是多少平方米？
<gadget id="calculator">800 / 2 / 2</gadget>
<output>200</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">150 * 50</gadget>
<output>7_500</output>

<result>7_500</result>