A book has 360 pages. I read 40% of the whole book on the first day and 25% of the whole book on the second day. How many pages are left?
一本书360页，第一天看了全书的40%，第二天看了全书的25%，这时还剩多少页没有看？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">360 * (7/20)</gadget>
<output>126</output>

<result>126</result>