To build a road, team A can complete the repair in 12 days alone, and team B can complete half of the road in 10 days alone. The two teams will practice together for 5 days, and the remaining team A will practice alone. How many days will it take?
修一条路，甲队单独修12天可以修完，乙队单独修10天可以修完这条路的一半．两队合修5天，剩下的甲队单独修，还需几天？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/12) + (1/20)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(2/15) * 5</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) / (1/12)</gadget>
<output>4</output>

<result>4</result>