Use a glass to pour water into the empty bottle. If 5 cups of water are poured, the total weight of the bottle is 470 grams; if 8 cups of water are poured, the total weight of the bottle is 680 grams. Then pour 6 cups of water, how much does the total weight of the bottle weigh?
用一个杯子向空瓶中倒水．如果倒进5杯水，连瓶共重470克；如果倒进8杯水，连瓶共重680克．那么倒进6杯水，连瓶共重多少克．
<gadget id="calculator">680 - 470</gadget>
<output>210</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">210 / 3</gadget>
<output>70</output>

<gadget id="calculator">70 * 5</gadget>
<output>350</output>

<gadget id="calculator">470 - 350</gadget>
<output>120</output>

<gadget id="calculator">70 * 6</gadget>
<output>420</output>

<gadget id="calculator">120 + 420</gadget>
<output>540</output>

<result>540</result>