Xiaohua reads a book. On the first day, he reads (1/3) of the whole book by 10 more pages. On the second day, he reads 50% of the whole book and has 20 less pages. There are 50 pages left. ).
小华看一本书，第一天看了全书的(1/3)多10页，第2天看了全书的50%少20页，还剩下50页没看，共几页(不要方程)．
<gadget id="calculator">10 - 20</gadget>
<output>-10</output>

<gadget id="calculator">(-10) + 50</gadget>
<output>40</output>

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

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">40 / (1/6)</gadget>
<output>240</output>

<result>240</result>