A canteen has enough rice for 6 people to eat for 5 days. After 6 people ate for 2 days, 4 people left. How many days can the rest be eaten?
某食堂存有可供6人可吃5天的米，6人吃了2天后，走了4人，余下的可吃多少天？
<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">12 / 30</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">2 / 30</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(3/5) / (1/15)</gadget>
<output>9</output>

<result>9</result>