A, B, and C move a pile of books. The books moved by A account for 1/2 of the sum of B and C. The books moved by B account for 1/3 of the sum of A and C. C moves 200 Book. How many books are there in total?
甲、乙、丙三人搬一堆书，甲搬的书占乙、丙之和的(1/2)，乙搬的书占甲、丙之和的(1/3)，丙搬了200本．这堆书一共有多少本？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

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

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

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

<gadget id="calculator">1 - (1/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">200 / (5/12)</gadget>
<output>480</output>

<result>480</result>