Uncle Wang’s family received 9 boxes of millet, weighing 59 kg, 57 kg, 63 kg, 60 kg, 61 kg, 58 kg, 59 kg, 62 kg, and 64 kg. How many kilograms of millet did his family collect?
王大爷家收了9框谷子，分别重59千克、57千克、63千克、60千克、61千克、58千克，59千克，62千克，64千克他家大约收了多少千克谷子？
<gadget id="calculator">60 + 60 + 60 + 60 + 60 + 60 + 60 + 60 + 60</gadget>
<output>540</output>

<result>540</result>