Zhang Hua finished reading a book in three days. He read (1/3) of the book on the first day, read the remaining 60% less than 10 pages on the second day, and finished the remaining 50 pages on the third day. How many pages are there?
张华三天看完一本书，第一天看了这本书的(1/3)，第二天看了余下的60%少10页，第三天将余下的50页看完，这本书一共有多少页？
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 / (2/5)</gadget>
<output>100</output>

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

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">100 / (2/3)</gadget>
<output>150</output>

<result>150</result>