Processing a batch of parts was originally planned to be completed in 15 days, but now the work efficiency has increased by 20%. Q: How many days can it be completed?
加工一批零件，原计划15天完成，现在工作效率提高了20%．问：几天可以完成？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(1/15) * (6/5)</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">1 / (2/25)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>