road construction team paved a section of railway. It was originally planned to pave 3.2 kilometers per day, and it took 15 days to complete the pavement. The actual pavement was 25% more than planned every day. How many days did it actually take? (Solve with ratio)
一个筑路队铺一段铁路，原计划每天铺3.2千米，15天铺完，实际每天比计划多铺25%，实际用了多少天？(用比例解)
<gadget id="calculator">3.2 * 15</gadget>
<output>48</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.2 * (1/4)</gadget>
<output>0.8</output>

<gadget id="calculator">3.2 + 0.8</gadget>
<output>4</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>