The bookstore has a total of 300 story books and technology books. The ratio of story books to technology books is 3:2. Later, some technology books were shipped in. At this time, the ratio of story books to technology books was 9:8. How many books?
书店有故事书和科技书共300本，故事书和科技书的比是3：2，后来又运来一些科技书，这时故事书和科技书的比是9：8，求又运来科技书多少本？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">9 + 8</gadget>
<output>17</output>

<gadget id="calculator">9 / 17</gadget>
<output>9/17 = around 0.529412</output>

<gadget id="calculator">(3/5) / (9/17)</gadget>
<output>17/15 = around 1.133333</output>

<gadget id="calculator">300 * (17/15)</gadget>
<output>340</output>

<gadget id="calculator">340 - 300</gadget>
<output>40</output>

<result>40</result>