Mixture problem : GMAT Problem Solving (PS)
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# Mixture problem

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Intern
Joined: 26 Feb 2011
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Mixture problem [#permalink]

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26 Feb 2011, 10:01
00:00

Difficulty:

25% (medium)

Question Stats:

92% (01:35) correct 8% (02:18) wrong based on 26 sessions

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If 20 litres of chemical X are added to 80 litres of a mixture that is 10% chemical X and 90% chemical Y, then what percentage of the resulting mixture is chemical X?
a- 15%
b - 28%
c - 33 1/3 %
d - 40%
e - 60%
[Reveal] Spoiler: OA
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Joined: 14 Feb 2011
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Re: Mixture problem [#permalink]

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26 Feb 2011, 11:13
80 litres mixture has 8 litres of chemical x and 72 litres of chemical y. when 20 litres is added, the new mixture is 100 litres and it has 28 litres of chemical os 28/100 = 28%
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Re: Mixture problem [#permalink]

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27 Feb 2011, 21:26
Answer is B - 28%. Reasoning same as given by beyondgmatscore above.
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Re: Mixture problem   [#permalink] 27 Feb 2011, 21:26
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# Mixture problem

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