Answer
$187,000 \text{ gal}$
Work Step by Step
Convert by multiplying $\dfrac{7.48 \text{ gal}}{1 \text{ ft}^3}$ to obtain:
$=\require{cancel}
25,000 \cancel{\text{ ft}^3} \cdot \dfrac{7.48\text{ gal}}{1 \cancel{\text{ ft}^3}}
\\=25,000(7.48) \text{ gal}
\\=187,000 \text{ gal}$