Question

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Answer 1

All together there are 48 + 30 books, which comes out to 78 books.  All discount packages contain the same number of books.

Think of the products of integers equal to 48:  3*16, 4*12, 6*8.  Are there more?

Think of the products of integers equal to 30:  3*10, 5*6, 2*15.  Are there more?

Think what these sets of factors have in common:  there could be 8 packages of 6 science books (48 books total); there could be 5 packages of 6 mysteries (30 total).   Doing this, we ensure that every package has the same number of books (6).  We can make (8+5), or 13, packages.

Check:  Does (6 books/package)(13 packages) = 78 books?  YES.

Answer 2

Answer:

6

Step-by-step explanation:

78/6=13