Pour water into an empty bottle with one cup. If you pour three cups of water, the weight of the bottle is 440G. If you pour four cups of water, the weight of the bottle is 500g. How much does a glass of water and an empty bottle weigh?

A glass of water weighs 500-440 = 60g
Empty bottle weight 440-60 * 3 = 440-180 = 260g

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