Answer:
3/4 of a gallon
Explanation:
There are 4 quarts in a gallon.
[tex]\begin{gathered} 4\text{ quarts = 1}\; \text{gallon} \\ \implies1\text{ quart = }\frac{1}{4}\text{ gallon} \end{gathered}[/tex]Therefore:
[tex]3\text{ quarts}=3\times\frac{1}{4}\text{ = }\frac{3}{4}\; \text{gallon}[/tex]Therefore, 3 quarts is 3/4 of a gallon.
