has a number of books, B borrowed half of them plus 3 books, C borrowed (1/3) plus 2 books for the rest, and (1/4) plus 1 books for the remaining books , In the end, A still has 2 books. How many books does A have?
甲有若干本书，乙借走了一半加3本，剩下的书，丙借走了(1/3)加2本，再剩下的书丁借走了(1/4)加1本，最后甲还有2本书，甲原来有多少本书？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / (3/4)</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 / (2/3)</gadget>
<output>9</output>

<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>