In a week, a fertilizer factory produces an average of 2,000 tons of fertilizer per day in the first three days, and a total of 15,000 tons of fertilizer in the last four days. How many tons of fertilizer is produced on average this week?
一个化肥厂在一星期里，前三天平均每天生产化肥0.2万吨，后四天共生产化肥1.5万吨，这个星期平均每天生产化肥多少万吨？
<gadget id="calculator">0.2 * 3</gadget>
<output>0.6</output>

<gadget id="calculator">0.6 + 1.5</gadget>
<output>2.1</output>

<gadget id="calculator">2.1 / 7</gadget>
<output>0.3</output>

<result>0.3</result>