A story book has x pages, Liu Fang reads 9 pages every day, and finishes it in 10 days.
一本故事书有x页，刘芳每天看9页，10天看完．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">9 / (1/10)</gadget>
<output>90</output>

<result>90</result>