## Basic College Mathematics (9th Edition)

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