 
<translate> Bayyana tsarin tunani mataki-mataki sannan kuma amsar karshe. Sally tana karanta shafuka 10 na littafi a ranakun mako da shafuka 20 a karshen mako. Idan ya ɗauki sati biyu don Sally ta gama littafinta, shafi nawa ne littafin yake da shi? <eng> Give the step-by-step reasoning process and then the final answer. 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? 