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If P and R were solutions of water and ammonia and if

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Joined: 26 Apr 2004
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If P and R were solutions of water and ammonia and if [#permalink] New post 05 Dec 2004, 07:05
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Difficulty:

  35% (medium)

Question Stats:

63% (02:03) correct 37% (01:20) wrong based on 197 sessions
If P and R were solutions of water and ammonia and if solution S consisted of 2 parts of P and 3 parts of R, what percent of solution S was ammonia?

(1) Solution P contained 10 percent ammonia and solution R contained 3 percent ammonia.
(2) There was a total of 10 liters of solution S.
[Reveal] Spoiler: OA
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 [#permalink] New post 07 Dec 2004, 07:38
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I agree with A
Let a-ammonia
w-water
then P= 0.1a+0.9w
R=0.03a+0.97w
S=2P+3R=2(0.1a+0.9w)+3(0.03a+0.97w)=0.29a+4.71w
then water is 94.2% and ammonia 5.8%

Am I right? :?
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Concentration: Technology, Finance
GMAT 1: 580 Q48 V21
WE: Information Technology (Computer Software)
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Re: If P and R were solutions of water and ammonia and if [#permalink] New post 26 Nov 2013, 12:15
Easy One.
Given: Solution S consisted of 2 parts of P and 3 parts of R.
Find: %ammonia in S= ?
1) Sufficient. If Solution P contained 10 percent ammonia and solution R contained 3 percent ammonia then
Concentration of final sol = {(2X)(.1) + (3X)(.03) }*100/ 5X
=29/5
=5.8%
Eliminate B,C,E.
2) No Sufficient.Eliminate D

Answer is A
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Re: If P and R were solutions of water and ammonia and if [#permalink] New post 28 Nov 2014, 22:37
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Re: If P and R were solutions of water and ammonia and if   [#permalink] 28 Nov 2014, 22:37
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