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# One kilogram of a certain coffee blend consists of x

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Senior Manager
Joined: 05 Jun 2008
Posts: 291
One kilogram of a certain coffee blend consists of x [#permalink]

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23 Nov 2008, 03:46
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One kilogram of a certain coffee blend consists of x kilogram of type I 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 0.15
(2) C >=7.30

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Manager
Joined: 08 Aug 2008
Posts: 226

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23 Nov 2008, 04:29
B.
$$x+y=1$$
$$6.5x + 8.5y>= 7.3$$...2eq can be solved for tentative value of x
Senior Manager
Joined: 05 Jun 2008
Posts: 291

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25 Nov 2008, 21:44
prasun84 wrote:
B.
$$x+y=1$$
$$6.5x + 8.5y>= 7.3$$...2eq can be solved for tentative value of x

Can pl explain, how we can solve for one value of x there can N no of value of X and Y which can satisfy the equation.
VP
Joined: 05 Jul 2008
Posts: 1337

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25 Nov 2008, 21:50
1
vivektripathi wrote:
prasun84 wrote:
B.
$$x+y=1$$
$$6.5x + 8.5y>= 7.3$$...2eq can be solved for tentative value of x

Can pl explain, how we can solve for one value of x there can N no of value of X and Y which can satisfy the equation.

If you look at the Q, it asks whether x < 0.8 and not what is x?

If we start with 6.5x + 8.5 y = 7.3 and keep increasing the value of c to 8.5 we will see x decreasing from 0.6 to 0. Hence it is always less than 0.8. So sufficient. Was I clear?

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: DS   [#permalink] 25 Nov 2008, 21:50
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