SOLUTION: PLEASE HELP WITH THE ANSWER TO THIS QUESTION: Books cost 40 cents and pamphlets 5 cents at the book sale. If Donnie spends $4.15 at the book sale and purchased 20 more pamphlets t

Question 207172This question is from textbook Algebra I: Incremental Development
: PLEASE HELP WITH THE ANSWER TO THIS QUESTION:
Books cost 40 cents and pamphlets 5 cents at the book sale. If Donnie spends $4.15 at the book sale and purchased 20 more pamphlets than he did books, how many pamphlets did he buy?
Thank you! This question is from textbook Algebra I: Incremental Development

Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
let B = number of books purchased.
let P = number of pamphlets purchased.
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.40 * B + .05 * P = $4.15
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Donnie purchased 20 more pamphlets than he did books.
this means that P = B + 20 which means that:
the number of pamphlets is equal to the number of books plus 20.
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Since , we can substitute for P in the money equation to get:

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simplifying this equation, we get:
which becomes:
which becomes:
which becomes:
which becomes:

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7 books are purchased and 27 pamphlets are purchased.
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total cost is
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