Xiaoyuan reads a book and reads 16 pages every day. After 5 days, there are still (3/7) of the book that have not been read. How many pages does this book have?
小圆看一本图书，每天看16页，5天后还剩这本书的(3/7)没看．这本书共有多少页？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">5 / (4/7)</gadget>
<output>35/4 = around 8.75</output>

<gadget id="calculator">16 * (35/4)</gadget>
<output>140</output>

<result>140</result>