Xiao Ming borrowed a science fiction novel, read the whole book (1/3) on the first day, read 50 pages on the second day, and finished half of the book in two days. How many pages does this book have? (solution by equation)
小明借了一本科幻小说，第一天看了全书的(1/3)，第二天看了50页，两天刚好看完书的一半，这本书共有多少页？(用方程解)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">50 / (1/6)</gadget>
<output>300</output>

<result>300</result>