A book has 156 pages in total. Xiaohua read 25% of the whole book on the first day and 1/6 of the whole book on the second day. How many pages are left?
一本书共156页，小华第一天读了全书的25%，第二天又读了全书的(1/6)，还剩下多少页没有读？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/4) - (1/6)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">156 * (7/12)</gadget>
<output>91</output>

<result>91</result>