Urban construction workers build a water pipe and replace the original 5-meter-long old pipes with new 8-meter-long pipes. Now 200 new tubes are used, how many old tubes can be replaced?
城建工人修建一条自来水管道，用每根8米长的新管换原来每根5米长的旧管．现用新管200根，可以换旧管多少根？
<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<gadget id="calculator">8 * 40</gadget>
<output>320</output>

<result>320</result>