#### Answer

$\frac{15}{4}$ gal or 3.75 gal

#### Work Step by Step

15 qt = gal
Use a unit fraction with gallon (the unit for your answer) in the numerator, and quarts (the unit being changed) in the denominator. Because 4 quarts (qt) = 1 gallon (gal), the necessary unit fraction is
$\frac{1 gal}{4 qt}$
Multiply 15 qt times the unit fraction.
15 * $\frac{1 gal}{4 qt}$ = $\frac{15}{4}$gal = 3.75 gal