Question
Harry drank 23 of the water in his water bottle. He accidentally spilled 12 of the remaining water. As a result, he had 40 mℓ of water left in his water bottle. How much water did Harry have at first? Give your answer in mℓ.
4 m

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Harry drank 23 of the water in his water bottle. He accidentally spilled 12 of the remaining water. As a result, he had 40 mℓ of water left in his water bottle. How much water did Harry have at first? Give your answer in mℓ.