A road construction team paved a section of road. It was originally planned to pave 3.2 kilometers per day and finish paving in 15 days. The actual daily shop is 25% more than the plan. How many days did it take less than planned?
一个筑路队铺一段路，原计划每天铺3.2千米，15天铺完．实际每天比计划多铺25%．实际比计划少用多少天？
<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">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">3.2 * (5/4)</gadget>
<output>4</output>

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

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<result>3</result>