In a week, a fertilizer factory produces an average of 1,600 tons of fertilizer per day in the first three days, and 1,950 tons of fertilizer per day in the last four days. How many tons of fertilizer is produced on average this week?
一个化肥厂在一个星期里，前三天平均每天生产化肥0.16万吨，后四天平均每天生产化肥0.195万吨，这个星期平均每天生产化肥多少万吨？
<gadget id="calculator">0.16 * 3</gadget>
<output>0.48</output>

<gadget id="calculator">0.195 * 4</gadget>
<output>0.78</output>

<gadget id="calculator">0.48 + 0.78</gadget>
<output>1.26</output>

<gadget id="calculator">1.26 / 7</gadget>
<output>0.18</output>

<result>0.18</result>