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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] New post 08 Jan 2008, 07:53
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Question Stats:

69% (01:53) correct 31% (02:23) wrong based on 34 sessions
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] New post 08 Jan 2008, 09:04
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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] New post 13 Oct 2014, 05:40
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Re: Material A costs $3 per kilogram, and material B costs $5 [#permalink] New post 13 Oct 2014, 06:37
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Re: Material A costs $3 per kilogram, and material B costs $5   [#permalink] 13 Oct 2014, 06:37
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Material A costs $3 per kilogram, and material B costs $5

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