A pile of 30 tons of coal is burned (1/10) every day, how many days can it be burned.
一堆煤30吨，每天烧(1/10)，多少天可以烧完．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>