There are 2 tons of rice in the cafeteria, eat (1/4) every day, how many days can you eat.
食堂有2吨大米，每天吃(1/4)，可以吃多少天．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / (1/4)</gadget>
<output>4</output>

<result>4</result>