Teacher Li and Xiaohua sort out a batch of books together. It takes 20 minutes for Teacher Li to sort out alone, and 30 minutes for Xiaohua to sort out alone. When it is finished, Teacher Li sorts out 96 more books than Xiaohua. How many books are there in total?
李老师和小华共同整理一批图书，李老师单独整理要20分钟，小华单独整理要30分钟，完成时李老师比小华多整理96本，这批图书一共多少本？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/20) + (1/30)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<gadget id="calculator">(1/20) * 12</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(1/30) * 12</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">96 / (1/5)</gadget>
<output>480</output>

<result>480</result>