A book has 240 pages, read (3/8) on the first day, and 20% on the second day. How many pages are left unread?
一本书有240页，第一天看了(3/8)，第二天看了20%．还剩多少页没有看？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">1 - (3/8) - (1/5)</gadget>
<output>17/40 = around 0.425</output>

<gadget id="calculator">240 * (17/40)</gadget>
<output>102</output>

<result>102</result>