Xiaoqiang swam back and forth twice in a 25-meter-long swimming pool. How many meters did he swim in total?
小强在长25米的游泳池里来回游了2个来回，他一共游了多少米．
<gadget id="calculator">2 * 2 * 25</gadget>
<output>100</output>

<result>100</result>