certain factory wanted to make 3,000 tents for Wenchuan earthquake-stricken areas. In the first 6 days, 250 pieces were produced every day. In order to allow the victims to live in tents as soon as possible, the worker uncle planned to produce 300 pieces a day for the rest. How many days are left to complete?
某厂要赶制3000顶帐篷送给汶川地震灾区．前6天每天生产250顶，工人叔叔为了能让灾民早日住进帐篷，余下的准备每天生产300顶．余下的还需多少天完成？
<gadget id="calculator">250 * 6</gadget>
<output>1_500</output>

<gadget id="calculator">3_000 - 1_500</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 / 300</gadget>
<output>5</output>

<result>5</result>