A football field is 100 meters long and 50 meters wide. Xiaoqiang ran around the perimeter of the field. How many meters did he run?
一个足球场长100米，宽50米，小强沿着场地外围跑了一圈，他跑了多少米？
<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<result>300</result>