The ratio of story books to popular science books is 3:2. I bought 8 more popular science books on Children’s Day on June 1st. At this time, popular science books accounted for 80% of the story books. How many story books were there?
故事书和科普书的比是3：2，"六一"儿童节又买了8本科普书，这时科普书是故事书的80%，原来故事书多少本？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">8 / (2/15)</gadget>
<output>60</output>

<result>60</result>