A story book, read (1/3) on the first day, read 20 pages less than the first day on the second day, and there are 35 pages left, how many pages does this book have?
一本故事书，第一天读了(1/3)，第二天比第一天少读20页，还剩35页，这本书有多少页？
<gadget id="calculator">35 - 20</gadget>
<output>15</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3) - (1/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 / (1/3)</gadget>
<output>45</output>

<result>45</result>