Xiaoli reads a book, read (1/6) of the whole book on the first day, (4/5) of the first day on the second day, and (2/5) of the total of the previous two days on the third day , I read the remaining 87 pages on the fourth day. How many pages does the book have?
小丽读一本书，第一天读了全书的(1/6)，第二天读了第一天的(4/5)，第三天读了前两天总数的(2/5)，第四天看了剩下的87页．问全书有多少页？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * (1/6)</gadget>
<output>2/15 = around 0.133333</output>

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

<gadget id="calculator">(2/5) * (1/6)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(2/5) * (4/5) * (1/6)</gadget>
<output>4/75 = around 0.053333</output>

<gadget id="calculator">1 - (1/6) - (2/15) - (1/15) - (4/75)</gadget>
<output>29/50 = around 0.58</output>

<gadget id="calculator">87 / (29/50)</gadget>
<output>150</output>

<result>150</result>