Level Mark and Nick each had the same volume of water. The water was used to pour into identical bottles. Mark filled up 15 bottles and had 3 ℓ of water left. Nick filled up 11 bottles and had 5 ℓ of water left.
What was the capacity of each bottle? Give your answer in millilitres.
What was the total volume of water Mark and Nick had at first? Give your answer in litres.