A chemical factory plans to produce 1,500 tons of fertilizers, 150 tons per day. After 3 days, improve work efficiency and produce 175 tons per day. How many days earlier than planned?
某化工厂计划要生产化肥1500吨，每天生产150吨，3天以后，提高工作效率，每天生产175吨，这样比计划提前几天完成？
<gadget id="calculator">1_500 / 150</gadget>
<output>10</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">150 * 3</gadget>
<output>450</output>

<gadget id="calculator">1_500 - 450</gadget>
<output>1_050</output>

<gadget id="calculator">1_050 / 175</gadget>
<output>6</output>

<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<result>1</result>