There are two bookshelves, A and B, and the (1/4) of the books stored in the A bookshelf is equal to the (2/5) of the B bookshelf. It is known that the A bookshelf stores 120 more books than the B bookshelf. How many books are stored in the two bookshelves?
有甲、乙两个书架，甲书架存书的(1/4)等于乙书架的(2/5)，已知甲书架比乙书架多存120本书，两个书架共存书多少本？
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">40 * 13</gadget>
<output>520</output>

<result>520</result>