The daily steelmaking volume of the steel factory in a week is 1500 tons, 1600 tons, 1700 tons, 2000 tons, 1900 tons, 1800 tons and 2100 tons respectively. How many tons of steel are produced on average per day?
炼钢厂在一星期中每天炼钢量分别是1500吨、1600吨、1700吨、2000吨、1900吨、1800吨、2100吨．平均每天炼钢多少吨？
<gadget id="calculator">1_500 + 1_600 + 1_700 + 2_000 + 1_900 + 1_800 + 2_100</gadget>
<output>12_600</output>

<gadget id="calculator">12_600 / 7</gadget>
<output>1_800</output>

<result>1_800</result>