The road construction team originally planned to build a 960-meter-long road in 20 days, but actually completed (3/4) of the road construction task in 12 days. At this speed, how many days can it be completed in advance?
修路队原计划20天修一段长960米的公路，实际12天完成了修路任务的(3/4)，照这样的速度，可以提前几天完成？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / 12</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">960 * (1/16)</gadget>
<output>60</output>

<gadget id="calculator">960 / 60</gadget>
<output>16</output>

<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<result>4</result>