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Material A costs $3 per kilogram, and material B costs $5

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Material A costs $3 per kilogram, and material B costs $5 [#permalink]

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New post 08 Jan 2008, 08:53
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Question Stats:

61% (01:14) correct 39% (02:11) wrong based on 86 sessions

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Material A costs $3 per kilogram, and material B costs $5 per kilogram. If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y?

(1) y > 4
(2) The cost of the 10 kilograms of material K is less than $40.

Open discussion of the question is here: material-a-costs-3-per-kilogram-and-material-b-costs-82349.html
[Reveal] Spoiler: OA

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Re: Material A costs $3 per kilogram, and material B costs $5 [#permalink]

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New post 08 Jan 2008, 10:04
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(1) y > 4. y=4.5 x=5.5 and y=9 x=1 both satisfied the condition but we can't answer the question.

(2) 3x+5y<40
x+y=10 ==> 4x+4y=40 ==> 3x+5y<4x+4y ==> y<x. SUFF.
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Re: Material A costs $3 per kilogram, and material B costs $5 [#permalink]

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New post 13 Oct 2014, 06:40
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Re: Material A costs $3 per kilogram, and material B costs $5 [#permalink]

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New post 13 Oct 2014, 07:37

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Re: Material A costs $3 per kilogram, and material B costs $5   [#permalink] 13 Oct 2014, 07:37
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Material A costs $3 per kilogram, and material B costs $5

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