The transport team had 840 kilograms of gasoline and used it for 15 days. With 240kg left, how many days will the remaining gasoline last?
运输队有840千克汽油，用了15天．还剩240千克，剩下的汽油还可以用几天？
<gadget id="calculator">840 - 240</gadget>
<output>600</output>

<gadget id="calculator">600 / 15</gadget>
<output>40</output>

<gadget id="calculator">240 / 40</gadget>
<output>6</output>

<result>6</result>