Liu Hua reads a story book, and reads (1/5) of the whole book every day, how many days can he finish it.
刘华看一本故事书，每天看全书的(1/5)，多少天可以看完．
<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>