To obtain the total amount of apples Gierum will use to bake her apple pies, the following steps are necessary:
Step 1: Write out the information given in the question, as follows:
Step 2: Use the information to solve the question by substituting in values where necessary, as follows:
Now:
Therefore, total amount of apples Gierum will use to bake her apple pies is 26.25 pies