In the first 4 days, the engineering team supplemented the stadium with an area of 200 square meters. At this speed, it took a total of 16 days to complete the field. How many square meters does the stadium have? (Solve with ratio)
工程队前4天辅运动场200平方米，照这样速度，共工作16天才辅完全场，这个运动场共有多少平方米．(用比例解)
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">50 * 16</gadget>
<output>800</output>

<result>800</result>