Final answer:
Fred stored 77 bales of hay in the barn, which is the result of subtracting the original 16 bales from the 93 bales present after he added more.
Step-by-step explanation:
The subject of this question is Mathematics, and it is appropriate for Middle School students. The question involves performing a simple subtraction to find out how many bales of hay were added to the barn.
To find the number of bales Fred stored in the barn, we subtract the original number of bales from the total number after he stacked more. Initially, there were 16 bales of hay in the barn. After Fred finished, there were 93 bales. The calculation we perform is:
93 bales (total now) - 16 bales (original amount) = 77 bales (stored by Fred)
So, Fred stored 77 bales of hay in the barn.