Answer:
To find the number of batches of granola bars the factory made, we need to divide the total amount of raisins used by the number of raisins used per batch.
First, we need to convert the mixed numbers to improper fractions:
4 5/6 = 29/6
9 2/3 = 29/3
Next, we can divide:
29/3 ÷ 29/6 = 29/3 x 6/29 = 6
Therefore, the factory made 6 batches of granola bars yesterday.