The length of the school playground is 60 meters and the width is 40 meters. How many meters is it to run twice around the playground?
学校操场的长是60米，宽是40米．绕操场跑两圈是多少米？
<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">100 * 2 * 2</gadget>
<output>400</output>

<result>400</result>