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GMAT Exam
The ornithologist interpreted the ravens' behavior as indicating that they were looking for another bird's food cache of which it did not know its exact location.

At a certain used-book store, the cost of each paperback book is x dollars and the cost of each hardcover book is y dollars. What is the cost of a hardcover book at the store?
(1)
At the store, the cost of 3 paperback books and 5 hardcover books is $12.25.
(2)
At the store, the cost of 9 paperback books and 15 hardcover books is $36.75.