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Samuel bought 30 books. The hardcover books cost 20 dollars while the paper back books cost 8 dollars. If the total amount of books costed 480 dollars, how many passer back books were purchased?
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5 votes
Samuel bought 30 books. The hardcover books cost 20 dollars while the paper back books cost 8 dollars. If the total amount of books costed 480 dollars, how many passer back books were purchased?

User AaronMK
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1 Answer

6 votes
$480 = x(20) + y(8)
where x+y=30

20 Hard covers = $400
10 Paper Backs = $80

80 + 400 = 480
User Pekka
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