Final answer:
Paul used 23/24 of a cup of milk to make muffins and nut bread.
Step-by-step explanation:
To find out how much milk Paul used to make muffins and nut bread, we need to add the amounts of milk used for each recipe. Paul used 5/8 of a cup of milk to make muffins and 1/3 of a cup of milk to make nut bread. To find the total milk used, we add 5/8 and 1/3:
5/8 + 1/3 = 15/24 + 8/24 = 23/24
Therefore, Paul used 23/24 of a cup of milk to make muffins and nut bread.