Master Wang completed 280 parts, 20% of the first day and 45% of the second day. How many parts are left?
王师傅完成280个零件，第一天完成了全部的20%，第二天完成了全部的45%，还剩多少个零件？
<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">(1/5) + (9/20)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

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

<result>98</result>