The school's rectangular playground is 175 meters long and 50 meters wide. How many meters is it to run two laps along the edge of the playground?
学校长方形的操场长175米，宽50米，沿操场边沿跑两圈是多少米．
<gadget id="calculator">175 + 50</gadget>
<output>225</output>

<gadget id="calculator">225 * 2 * 2</gadget>
<output>900</output>

<result>900</result>