It takes 15 days for a road repair team to repair a road, if it repairs 48 meters per day. Now repair 12 meters more every day, how many days will it take to finish repairing?
修路队修一条路，如果每天修48米，需15天修完．现在每天多修12米，需要多少天修完．
<gadget id="calculator">48 * 15</gadget>
<output>720</output>

<gadget id="calculator">48 + 12</gadget>
<output>60</output>

<gadget id="calculator">720 / 60</gadget>
<output>12</output>

<result>12</result>