A pile of 12 tons of coal is used for (1/3) tons per day, how many days can it be used?
一堆煤12吨，每天用(1/3)吨，可用多少天．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 / (1/3)</gadget>
<output>36</output>

<result>36</result>