Master Zhang processes a batch of parts, and plans to process 72 per day, and the task can be completed in 10 days. Actually process 90 parts per day, how many days to complete the task? (using proportional method)
张师傅加工一批零件，计划每天加工72个，10天可以完成任务．实际每天加工90个零件，实际几天完成任务？(用比例法)
<gadget id="calculator">72 * 10</gadget>
<output>720</output>

<gadget id="calculator">720 / 90</gadget>
<output>8</output>

<result>8</result>