Distribute a batch of books to Classes A, B, and C. Class B gets (1/5), and the remaining books are distributed to Classes A and C at a ratio of 3:1. It is known that Class A gets 10 more books than Class C. How many books are there in total?
把一批书分给甲乙丙三班，乙班分得(1/5)，剩下的按3：1分给甲、丙二班，已知甲班比丙多分得10本．这批书共有多少本？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 / (4/5)</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>