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One kilogram of a certain coffee blend consists of X

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One kilogram of a certain coffee blend consists of X [#permalink] New post 11 May 2008, 05:11
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One kilogram of a certain coffee blend consists of X kilogram of type ! coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where C=6.5x + 8.5y. Is x< 0.8?

1) y >0.5
2) C>=7.30
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Re: DS: coffee blend [#permalink] New post 11 May 2008, 11:21
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1) y >0.5 --> x<0.5 (as x+y=1 kg) --> x<0.8 sufficient
2) C>=7.30 --> 6.5x + 8.5(1-x) >= 7.3 --> 1.2>=2x --> x<=0.6 --> x<0.8 sufficient
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Re: DS: coffee blend   [#permalink] 11 May 2008, 11:21
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