Uncle Li packed a batch of shiitake mushrooms in the same big bag, and there were 70 bags in total. He weighed 5 of them, and the results were 21 kg, 19 kg, 18 kg, 22 kg, and 20 kg. Estimate, how many kilograms are there in total for this batch of shiitake mushrooms?
李大爷把收获的一批香菇装在同样大的袋子里，一共装了70袋．他称了其中的5袋，结果分别是21千克、19千克、18千克、22千克、20千克．估算一下，这批香菇大约一共有多少千克？
<gadget id="calculator">20 * 70</gadget>
<output>1_400</output>

<result>1_400</result>