The power supply bureau repaired a section of line, repairing an average of 600 meters per day, and it took 18 days to complete. If the work efficiency is increased by 20%, how many days can the repair be completed?
供电局修一段线路，平均每天修600米，要18天完成．如果工作效率提高20%，几天可以修完？
<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/18) * (1/5)</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">(1/18) + (1/90)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>