Xiao Li reads a story book, she reads it every day (1/15), how many days does it take to finish it.
小丽看一本故事书，她每天看(1/15)，多少天才能看完．
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>