The school playground is a rectangle with a length of 100 meters and a width of 50 meters. Li Ming ran 3 laps along the playground every morning, how many meters did he run?
学校运动场是一个长方形，长100米，宽50米．李明每天早晨沿运动场跑3圈，跑了多少米？
<gadget id="calculator">100 + 50</gadget>
<output>150</output>

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

<gadget id="calculator">300 * 3</gadget>
<output>900</output>

<result>900</result>