A swimming pool is 50 meters long. Xiao Ming swam 2 back and forth in the swimming pool. How many meters did he swim in total?
一个游泳池长50米，小明在游泳池里游了2个来回，他一共游了多少米？
<gadget id="calculator">50 * 2 * 2</gadget>
<output>200</output>

<result>200</result>