A certain factory shipped 36 tons of coal, but 20 tons have been burned, what percentage of the remaining coal is less than the burned one?
某工厂运来36吨煤，已经烧了20吨，剩下的煤比烧掉了的少几分之几？
<gadget id="calculator">36 - 20</gadget>
<output>16</output>

<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<gadget id="calculator">4 / 20</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>