Smile and read a 150-page extra-curricular book. I read the whole book on the first day (1/10), read the whole book on the second day (1/5), and read the whole book on the third day (1/15). How many pages are left unread?
笑笑看一本150页的课外书，第一天看全书的(1/10)，第二天看了全书的(1/5)，第三天看了全书的(1/15)，三天后还剩下多少页没有看？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) + (1/5) + (1/15)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">1 - (11/30)</gadget>
<output>19/30 = around 0.633333</output>

<gadget id="calculator">150 * (19/30)</gadget>
<output>95</output>

<result>95</result>