Two weeks has 5*2=<<5*2=10>>10 weekdays.

Two weeks has 2*2=<<2*2=4>>4 weekends.

On weekdays, she reads 10*10=<<10*10=100>>100 pages in total.

On weekends, she reads 20*4=<<20*4=80>>80 pages in total.

So the book has 100+80=<<100+80=180>>180 pages.

# Answer

180
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Sally reads 10 pages of a book on weekdays and 20 pages on weekends. If it takes 2 weeks for Sally to finish her book, how many pages that book has?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
180
Sally reads 10 pages of a book on weekdays and 20 pages on weekends. If it takes 2 weeks for Sally to finish her book, how many pages that book has?
train