Xiao Ming plans to read a book every day (2/9), how many days can he finish it.
一本书，小明计划每天看(2/9)，多少天可以看完．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / (2/9)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>