#### Answer

$\frac{4}{1}$

#### Work Step by Step

5 gallons to 5 quarts.
(5 gallons)/(5 quarts)
Now let’s first convert gallon into quart. As 1 gallon is 4 quarts. Multiply numerator by 4.
(5 gallons)/(5 quarts)×(4 quarts)/(1 gallon)= 20/5= (20 ÷ 5)/(5 ÷5)= $\frac{4}{1}$
Ratio in its lowest term is $\frac{4}{1}$.