A rope is 10 meters long, and if (1/5) is used every day, how many days can it all be used up?
一根绳子有10米，每天用去(1/5)，多少天可以全部用完．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>