To find out how many days Stanley needs to spend making 12 liters of jam, we first need to determine his rate of making jam in liters per day.
From the information given, Stanley jarred 9 liters of jam in 3 days. We can find his unit rate of making jam as follows:
\[ \text{Unit Rate} = \frac{9 \text{ liters}}{3 \text{ days}} = 3 \text{ liters/day} \]
Now that we have Stanley's rate of making jam, we want to find out how many days it will take him to make 12 liters of jam.
To find the number of days required to make 12 liters, we can set up the equation:
\[ \text{Number of Days} = \frac{\text{Total Liters}}{\text{Liters per Day}} = \frac{12 \text{ liters}}{3 \text{ liters/day}} = 4 \text{ days} \]
Thus, Stanley needs to spend 4 days making jam to jar a total of 12 liters.
\[ \text{Answer: } 4 \text{ days} \]
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