Weimin Rice Factory needs to process 520 tons of rice. It started processing 30 tons per day for 8 days, and the rest will be completed within a week. How many tons of rice will be processed on average every day?
为民米厂要完成520吨大米加工任务，开始每天加工30吨，加工了8天，剩下的要在一个星期内完成，那么以后平均每天要加工大米多少吨？
<gadget id="calculator">30 * 8</gadget>
<output>240</output>

<gadget id="calculator">520 - 240</gadget>
<output>280</output>

<gadget id="calculator">280 / 7</gadget>
<output>40</output>

<result>40</result>