The road repair team builds 3.2 meters of road every day, and it can be completed in 15 days. Actually, it repairs 4 meters a day. How many days can it be completed?
修路队每天修路3.2米，15天可以修完，实际每天修4米，几天可以修完？
<gadget id="calculator">3.2 * 15</gadget>
<output>48</output>

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

<result>12</result>