Liu Hua reads a story book, and reads the whole book every day (2/15), how many days can he finish it.
刘华看一本故事书，每天看全书的(2/15)，多少天可以看完．
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / (2/15)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>