Xiaoshuang finished reading a 90-page book in 3 days. She read 5 pages more on the first day than on the second day, and 5 pages more on the second day than on the third day. How many pages did Xiaoshuang read on the second day?
小双3天读完一本90页的书，第一天比第二天多读5页，第二天比第三天多读5页，小双第二天读了多少页．
<gadget id="calculator">90 - 5</gadget>
<output>85</output>

<gadget id="calculator">5 + 85</gadget>
<output>90</output>

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

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

<result>30</result>