An engineering team wants to repair a 300km road. 15% of the road was repaired in the first week, and 20% of the road was repaired in the second week. How many kilometers are left to be repaired?
一个工程队要修一条长300km的公路，第一周修了这条公路的15%，第二周修了这条公路的20%，还剩多少km没有修？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (1/5) - (3/20)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">300 * (13/20)</gadget>
<output>195</output>

<result>195</result>