To determine the greatest number of books and magazines Julie can put on each shelf without mixing them, we need to find the highest common factor (HCF) of the given numbers.
The prime factorization of 36 is 2^2 * 3^2.
The prime factorization of 54 is 2 * 3^3.
To find the HCF, we take the highest power of each common prime factor. In this case, the HCF would be 2^2 * 3^2, which is 4 * 9 = 36.
Therefore, Julie can put a maximum of 36 books and 36 magazines on each shelf without mixing them.

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