For a book, Li Ming read 150 pages on the first day, and the rest (5/9) on the second day. It is known that the ratio of the number of pages read to the number of remaining pages is 5:1. How many pages does this book have?
一本书，李明第一天看了150页，第二天看了余下的(5/9)，已知看了的页数与余下的页数比为5：1．这本书有多少页？
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">5 - (5/4)</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">150 / (15/4)</gadget>
<output>40</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">40 * 6</gadget>
<output>240</output>

<result>240</result>