To build a road, 5 people repair 300 meters in 6 days. At this speed, how many people are needed to repair 4000 meters in 40 days?
修一条路，5人6天修300米，照这样的速度，要想40天修4000米，需要多少人？
<gadget id="calculator">300 / 6 / 5</gadget>
<output>10</output>

<gadget id="calculator">10 * 40</gadget>
<output>400</output>

<gadget id="calculator">4_000 / 400</gadget>
<output>10</output>

<result>10</result>