Zhang Village dug a 1,200-meter-long canal and planned to finish digging in 15 days. Actually digging 20 meters more than planned every day, how many days did it actually take?
张村挖一条长1200米的水渠，计划15天挖完．实际每天比计划多挖20米，实际用了多少天？
<gadget id="calculator">1_200 / 15</gadget>
<output>80</output>

<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">1_200 / 100</gadget>
<output>12</output>

<result>12</result>