garment factory plans to complete a batch of orders in 20 days, but actually makes 20 sets a day, but the task is completed 5 days ahead of schedule. How many sets were originally planned to be made per day?
一个服装厂计划20天完成一批订单，实际每天做20套，结果提前5天完成任务，原计划每天做多少套？
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">15 / 20</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<result>15</result>