A bookshelf has upper and lower layers. Put a batch of books on the bookshelf. It is known that the upper layer accounts for (5/8) of the books. If 10 books are taken from the upper layer and placed on the lower layer, the upper layer is 4 less than the lower layer. How many books are there in total?
一书架有上下两层，将一批书放到书架上，已知上层占这批书的(5/8)，如果从上层的书中取出10本书放到下层，则上层比下层少4本，这批书一共有多少本？
<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/8) - 1</gadget>
<output>-3/8 = around -0.375</output>

<gadget id="calculator">(5/8) + (-3/8)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16 / (1/4)</gadget>
<output>64</output>

<result>64</result>