Use a glass to pour water into an empty bottle. If 3 cups of water are poured in, the total weight of the bottle is 440 grams. If 5 cups of water are poured in, the total weight of the bottle is 600 grams. What is the weight of 20 cups of water in grams?
用一个杯子向一个空瓶里倒水．如果倒进3杯水，连瓶共重440克，如果倒进5杯水，连瓶共重600克，20杯水重多少克．
<gadget id="calculator">600 - 440</gadget>
<output>160</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">80 * 20</gadget>
<output>1_600</output>

<result>1_600</result>