The temperature in a certain week in May is 18, 19°, 20°, 19°, 21°, 23° and 20° respectively. What is the daily average temperature in this week?
五月份某周气温分别是18、19°、20°、19°、21°、23°和20°，这一周每日平均气温是多少度．
<gadget id="calculator">18 + 19 + 20 + 19 + 21 + 23 + 20</gadget>
<output>140</output>

<gadget id="calculator">140 / 7</gadget>
<output>20</output>

<result>20</result>