When Congcong reads a book, he has read (4/9) of the total pages, and the number of pages he has not read is 18 more than the number of pages he has read. How many pages does this story book have?
聪聪看一本书，已看了总页数的(4/9)，还没有看的页数比已看的页数多18页，这本故事书有多少页？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9) - (4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">18 / (1/9)</gadget>
<output>162</output>

<result>162</result>