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Mathematics, 22.09.2019 09:50 callmedarthvadorplz

His collection contains two types of cards. a pack of trading card a cost $4, and a pack of trading card b cost $7. how many packs of each type of trading card were purchased if the total number of packs is 11.

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His collection contains two types of cards. a pack of trading card a cost $4, and a pack of trading...
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