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Library Fines

Minerva's school library charges a fine on each overdue library book. The fine was $0.25 plus $0.12 per day. Minerva was fined over $13. What is the minimum number of days that Minerva had an overdue book? What is the least amount of money that she owed?

(Source: Adapted from Mathematics Teaching in the Middle School, Sep-Oct1994)

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