Xiaoying reads a story book. She reads the whole book (3/8) on the first day and the rest (2/5) on the second day. At this time, there are still 45 pages left. How many pages does this book have?
小英读一本故事书，第一天读了全书的(3/8)，第二天读了剩下的(2/5)，这时还剩45页没有读．这本书共有多少页？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/8) * (2/5)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/8) - (1/4)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">45 / (3/8)</gadget>
<output>120</output>

<result>120</result>