Shixin Watch Factory originally planned to produce 75 watches per day and complete the task in 12 days. The actual production is 15 more than the plan per day, how many days to complete the task?
时新手表厂原计划每天生产75块手表，12天完成任务．实际比计划每天多生产15块，实际多少天完成任务？
<gadget id="calculator">75 * 12</gadget>
<output>900</output>

<gadget id="calculator">75 + 15</gadget>
<output>90</output>

<gadget id="calculator">900 / 90</gadget>
<output>10</output>

<result>10</result>