Answer:
Tom will need 
gallons of fruit drink.
Step-by-step explanation:
Hint- This question can be solved by unitary method.
Tom has a recipe for punch that calls for 
gallon of fruit drink.
i.e for 1 batch of the punch Tom needs gallon of fruit drink.
For 
batch of the punch Tom needs 
gallons of fruit drink.
Therefore, Tom will need gallons of fruit drink.
3 units is the answer you're looking for
I converted the four months into a fraction, and got 1/3. There's 12 months in a year, and divided by 4, I got 3.
Assuming, it's decimal logarithm.
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