A pile of garbage totaled 280 tons. The sanitation workers removed 20% of the total garbage on the first day and 45% of the total garbage on the second day. How much garbage remained?
一堆垃圾共280吨，环卫工人第一天运走全部垃圾的20%，第二天运走全部垃圾的45%，还有多少垃圾没运走？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (1/5) - (9/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">280 * (7/20)</gadget>
<output>98</output>

<result>98</result>