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# Mixture problem

Author Message
Intern
Joined: 26 Feb 2011
Posts: 37
Followers: 1

Kudos [?]: 109 [0], given: 1

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26 Feb 2011, 11:01
00:00

Difficulty:

15% (low)

Question Stats:

93% (01:37) correct 7% (02:18) wrong based on 28 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
Manager
Joined: 14 Feb 2011
Posts: 194
Followers: 4

Kudos [?]: 135 [0], given: 3

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26 Feb 2011, 12:13
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%
SVP
Joined: 16 Nov 2010
Posts: 1666
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 34

Kudos [?]: 533 [0], given: 36

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27 Feb 2011, 22:26
Answer is B - 28%. Reasoning same as given by beyondgmatscore above.
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Re: Mixture problem   [#permalink] 27 Feb 2011, 22:26
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