itisSheldon wrote:
A certain bookstore sold 1/2 of the books in its stock. Then, after an aggressive advertising campaign, the bookstore sold 1/3 of the remaining books in its stock. How many of the books did the bookstore sell from its stock?
1) After the advertising campaign, the bookstore was left with 20 unsold books.
2) Before the advertising campaign, the bookstore had sold 30 books.
When 1/2 books are sold, remaining books = 1/2. Of this 1/3 are sold, which means 1/3 of 1/2 = 1/6 more books sold. Thus total
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