The cafeteria shipped 3.6 tons of coal and planned to burn it for one month (30 days), but actually burned 20 kg less coal per day than planned. How many days can this batch of coal be burned?
食堂运来3.6吨煤，计划烧一个月(30天)，实际每天比计划少烧20千克煤，这批煤可以烧多少天？
<gadget id="calculator">3.6 * 1_000</gadget>
<output>3_600</output>

<gadget id="calculator">3_600 / 30</gadget>
<output>120</output>

<gadget id="calculator">120 - 20</gadget>
<output>100</output>

<gadget id="calculator">3_600 / 100</gadget>
<output>36</output>

<result>36</result>