The fertilizer factory plans to produce 5.5 tons of fertilizer, with an average production of 0.25 tons per day, and an average of 0.1 tons more per day after 8 days. How many days will it take to complete the production of this batch of fertilizers?
化肥厂计划生产5.5吨化肥，平均每天生产0.25吨，8天后平均每天多生产0.1吨，完成生产这批化肥还需要用多少天？
<gadget id="calculator">0.25 * 8</gadget>
<output>2</output>

<gadget id="calculator">5.5 - 2</gadget>
<output>3.5</output>

<gadget id="calculator">0.25 + 0.1</gadget>
<output>0.35</output>

<gadget id="calculator">3.5 / 0.35</gadget>
<output>10</output>

<result>10</result>