Li Xiaojun reads a 200-page story book. He reads 30% of the whole book on the first day and 25% of the whole book on the second day. How many pages are left?
李小军看一本200页的故事书，第一天看了全书的30%，第二天看了全书的25%，还剩多少页没有看？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/4) - (3/10)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">200 * (9/20)</gadget>
<output>90</output>

<result>90</result>