Xiaoxiao reads a story book, the whole book has 200 pages, and I read 60% of the whole book in the first 3 days. At this speed, how many days can I finish reading the book?
笑笑读一本故事书，全书共200页，前3天读了全书的60%，照这样的速度，再用多少天可以将书读完？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) / 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/5) / (1/5)</gadget>
<output>2</output>

<result>2</result>