There are 6 apples, weighing 320g, 290g, 300g, 305g, 330g, 315g respectively. After eating one, the average weight of the remaining apples is 311g. How much does the eaten apple weigh?
有6个苹果，分别重320g、290g、300g、305g、330g、315g．吃掉一个后，剩下的苹果平均每个重311g，吃掉的苹果重多少？
<gadget id="calculator">320 + 290 + 300 + 305 + 330 + 315</gadget>
<output>1_860</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">311 * 5</gadget>
<output>1_555</output>

<gadget id="calculator">1_860 - 1_555</gadget>
<output>305</output>

<result>305</result>