【Question 11】
Xiao Ling is reading an interesting storybook. Every day she reads twice the number of pages she has read in the previous days, and on the sixth day, she read $\frac{1}{9}$ of the book. On which day did Xiao Ling finish reading the book?
【Analysis and Solution】Fraction Application Problem.
On the 6th day, she read $\frac{1}{9}$ of the book;
From day $1 \sim 5$, she read $\frac{1}{9} \div 2=\frac{1}{18}$ of the book;
From day $1 \sim 6$, she read $\frac{1}{18}+\frac{1}{9}=\frac{1}{6}$ of the book;
On the 7th day, she read $\frac{1}{6} \times 2=\frac{1}{3}$ of the book;
From day $1 \sim 7$, she read $\frac{1}{6}+\frac{1}{3}=\frac{1}{2}$ of the book;
Xiao Ling finished reading the book on the 8th day.