The road repair team originally planned to build 3.2 kilometers of road every day, which could be completed in 15 days. Actually repair 0.8 kilometers more every day, how many days can it be completed? (Solve with ratio)
修路队原计划每天修路3.2千米，15天可以修完．实际每天多修0.8千米，多少天可以修完？(用比例解)
<gadget id="calculator">3.2 * 15</gadget>
<output>48</output>

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

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

<result>12</result>