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31-01-2017
Mathematics

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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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Binski12 Binski12

31-01-2017

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

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

80 + 400 = 480

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