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Mixture problem

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Intern
Intern
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Joined: 26 Feb 2011
Posts: 42
Followers: 1

Kudos [?]: 30 [0], given: 1

Mixture problem [#permalink] New post 26 Feb 2011, 10:01
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

100% (01:47) correct 0% (00:00) wrong based on 10 sessions
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
Manager
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Joined: 14 Feb 2011
Posts: 197
Followers: 4

Kudos [?]: 76 [0], given: 3

Re: Mixture problem [#permalink] New post 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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Joined: 16 Nov 2010
Posts: 1680
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 31

Kudos [?]: 352 [0], given: 36

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Re: Mixture problem [#permalink] New post 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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