let 'c' be the number of gallons of chocolate ice cream that was sold.
Since the ice cream parlor sold 5/6 more of chocolate than vanilla and strawberry combined, we have:
[tex]c=\frac{5}{6}+\frac{7}{12}+\frac{1}{4}=\frac{10+7+3}{12}=\frac{20}{12}=\frac{5}{4}=1\frac{1}{4}[/tex]thus, the ice cream parlor sold 1 1/4 gallons of chocolate ice cream