Xiaoqiang reads a 60-page technical book. He reads (1/4) of the total pages in the morning and 20% of the total pages in the afternoon. How many pages are left unread?
小强看一本60页的科技书，上午看了总页数的(1/4)，下午看了总页数的20%，还余下多少页没有看？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">60 * (11/20)</gadget>
<output>33</output>

<result>33</result>