We can apply the operation of division to solve this question.
The amount of juice he drank is 1/4 gallon of apple juice.
The total amount of juice = 3/4 gallon of apple juice
Amount of Juice he drank = 1/3 of the Total amount
Hence, the amount of juice he drank is calculated as:
1/3 of 3/4 gallon
= 1/3 × 3/4 gallon
= 1/4
Therefore, the amount of juice he drank is 1/4 gallon of apple juice.
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