3. Xiaoming spent 3 days reading a storybook, each day reading $\frac{1}{4}$ of the book plus 6 pages. The storybook has a total of $\qquad$ pages.
【Analysis】In 3 days, $\frac{3}{4}$ of the book plus 18 pages were read, so $\frac{1}{4}$ of the book is 18 pages, which means the book has 72 pages.