Xiaohua's family successively bought two batches of chicks. The first batch of 20 each weighed 60 grams, and the second batch of 30 each weighed 70 grams. What is the average weight of Xiaohua's chickens?
小华家先后买了两批小鸡．第一批的20只每只重60克，第二批的30只每只重70克．小华家的小鸡平均多重？
<gadget id="calculator">20 * 60</gadget>
<output>1_200</output>

<gadget id="calculator">30 * 70</gadget>
<output>2_100</output>

<gadget id="calculator">1_200 + 2_100</gadget>
<output>3_300</output>

<gadget id="calculator">20 + 30</gadget>
<output>50</output>

<gadget id="calculator">3_300 / 50</gadget>
<output>66</output>

<result>66</result>