A rectangular playground is 100 meters long and twice as wide. How many meters does Xiao Ming need to run around the playground?
一个长方形操场，长100米，是宽的2倍，小明沿操场跑一圈，要跑多少米？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

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

<result>300</result>