Xiaoliang has already swam 4 back and forth in the swimming pool for a total of 200 meters. How long is the swimming pool?
小亮在游泳池中已经有了4个来回共游了200米，游泳池长多少米．
<gadget id="calculator">200 / 4 / 2</gadget>
<output>25</output>

<result>25</result>