SOLUTION: Mrs.Jonson just purchased a total of 12 books and magazines for her office. The total bill was $112. She spent $16 on magazines, and the books cost $12 each. How many books did she

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Question 1112297: Mrs.Jonson just purchased a total of 12 books and magazines for her office. The total bill was $112. She spent $16 on magazines, and the books cost $12 each. How many books did she buy.
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
ITEMS       QUANT            PRICE            COST

BOOKS                         $12 ea.

MAGAZINES                                        $16

TOTAL           12                             $112

Find the cost for the books by difference and use this to find the quantity of the books.

112-16=96
$96 for the books.

b, number of books,
12b=96
b=96%2F12

b=8
Eight books bought.

How many magazines?
12-8=4
Four magazines were bought.

Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.
In my school years we presented the solution in  one line:



          The number of books = %28112-16%29%2F12 = 96%2F12 = 8.



The most advanced of us, young students, could notice that the info  " . . . a total 12 books . . . "  is EXCESSIVE and NON-NECESSARY 

and is not used in the solution.