Hongfeng Garment Factory makes a batch of garments, and plans to make 250 sets per day, which will be completed in 18 days. Actually make 50 sets more than the original plan every day, how many days can actually complete the task?
红枫服装厂做一批服装，计划每天做250套，18天完成．实际每天比原计划多做50套，实际多少天可以完成任务？
<gadget id="calculator">250 * 18</gadget>
<output>4_500</output>

<gadget id="calculator">250 + 50</gadget>
<output>300</output>

<gadget id="calculator">4_500 / 300</gadget>
<output>15</output>

<result>15</result>