A small team has built a road (1/3), and there is still 300 meters away from the midpoint. Find the total length?
一小队修一条公路已经修了(1/3)，离中点还有300米，求总长度？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">300 / (1/6)</gadget>
<output>1_800</output>

<result>1_800</result>