A bookshelf has two layers of books, with a total of 105 books. After removing 10 books from the first layer, the number of books on the second layer is 5 more than twice that of the first layer. So how many books are there on the second floor?
一个书架有两层书，共有105本，从第一层拿走10本书后，第二层书的本数比第一层的2倍还多5本．那么第二层有多少本书．
<gadget id="calculator">105 - 5 - 10</gadget>
<output>90</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">60 + 5</gadget>
<output>65</output>

<result>65</result>