The lanes of a swimming pool are 50 meters long. Xiaohua swam 7 back and forth in this swimming pool, how many meters did he swim in total?
一个游泳池的泳道长50米．小华在这个游泳池里游了7个来回，他一共游了多少米？
<gadget id="calculator">50 * 2 * 7</gadget>
<output>700</output>

<result>700</result>