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Bill has a collection of new and used trading cards that he stores

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Bill has a collection of new and used trading cards that he stores  [#permalink]

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New post 07 Nov 2016, 05:45
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D
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Difficulty:

  35% (medium)

Question Stats:

80% (02:45) correct 20% (03:34) wrong based on 69 sessions

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Bill has a collection of new and used trading cards that he stores in two albums. His first album contains 200 cards, 60% of which are used. If 90% of the cards in his second album are used, and 65% of all of his cards are used, what is the total number of trading cards in Bill’s collection?

290
260
254
240
156
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Re: Bill has a collection of new and used trading cards that he stores  [#permalink]

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New post 07 Nov 2016, 06:40
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grantcke wrote:
Bill has a collection of new and used trading cards that he stores in two albums. His first album contains 200 cards, 60% of which are used. If 90% of the cards in his second album are used, and 65% of all of his cards are used, what is the total number of trading cards in Bill’s collection?

290
260
254
240
156


Let, Total Cards in second collection = B

(60/100)*200 + (90/100)*B = (65/100)*(200+B)

i.e. B = 40

i.e Total cards = 200+B = 240

Answer: OPtion D
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Re: Bill has a collection of new and used trading cards that he stores   [#permalink] 07 Nov 2016, 06:40
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Bill has a collection of new and used trading cards that he stores

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