Use a cup to pour water into an empty plastic pot. If one cup of water is poured, the weight of the pot is 310 grams; if 4 cups of water are poured, the weight of the pot is 760 grams. How many grams does a glass of water weigh?
用一只杯子往一只空塑料壶里倒水，如果倒进一杯水，连壶共重310克；如果倒4杯水，连壶共重760克．一杯水重多少克？
<gadget id="calculator">760 - 310</gadget>
<output>450</output>

<gadget id="calculator">450 / 3</gadget>
<output>150</output>

<result>150</result>