To build a road, the first time to repair the entire length (1/4), and the second time to repair 15% of the entire length. At this time, there is still 6 kilometers away from the middle point of the road. How long is this road?
修一条公路，第一次修全程的(1/4)，第二次又修了全程的15%，这时离公路中点还有6千米．这条公路有多长？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/2) - (1/4) - (3/20)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 / (1/10)</gadget>
<output>60</output>

<result>60</result>