Question
Xuan combined 2 bottles of the kiwi juice to make kiwi punch for her brothers at a parade. Each bottle had 400 mℓ of the kiwi juice. After the parade, 340 mℓ of kiwi punch was left. How much kiwi punch did her brothers drink in mℓ?
4 m

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Xuan combined 2 bottles of the kiwi juice to make kiwi punch for her brothers at a parade. Each bottle had 400 mℓ of the kiwi juice. After the parade, 340 mℓ of kiwi punch was left. How much kiwi punch did her brothers drink in mℓ?