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1 October, 23:22

Alana and Petra go to a used book sale, where every book is the same price. Alana buys 5 books and Petra buys 4 books. They run into their friend Angus, who really loves to read, and discover that he has bought 19 books. Angus received a $10 discount, but he still spent $5 more than Alana and Petra combined. How much does one book cost?

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  1. 1 October, 23:40
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    Alana and Petra bought 9 books combined.

    Angus bought 19 books and had a $10 discount.

    Angus spent $5 more than Alana and Petra combined.

    This means that the price of 19 books is $15 more than the price of 9 books. 19 books is 10 books more than 9 books.

    Giving you 10 books = $15, 1 book = $1.50
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