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Mathematics

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Peter sells cards in packs of 12 and envelopes in packs of 27. If Martha wants the same number of each, what is the minimum number of cards that she will have to buy?

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Oseafeid Oseafeid

she will need to buy at least three hundred and twenty four cards (324) cards.

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AL2006id AL2006id

The lowest common multiple of 12 and 27 is 108.

12 x 9 = 108 and
27 x 4 = 108 .

So she has to buy 9 packs of cards ... 108 of them ... and 4 packs of envelopes.

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