Mathematics, 08.09.2020 22:01, anabellabenzaquen

5. Jenny bought 4 books in a bookstore. The prices of the first 3 books
were $10, $15 and $25. The average price she paid for the 4 books
was $18 per book. How much did she pay for the 4th book?

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5. Jenny bought 4 books in a bookstore. The prices of the first 3 books
were $10, $15 and $25...