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# X grams of water were added to the 80 grams of a strong

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Manager
Joined: 04 Jun 2008
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X grams of water were added to the 80 grams of a strong [#permalink]  30 Aug 2008, 04:27
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$$X$$ grams of water were added to the 80 grams of a strong solution of acid. As a result, the concentration of acid in the solution dropped by $$Y$$ percent. What was the concentration of acid in the original solution?

1. $$X = 80$$
2. $$Y = 50$$
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Joined: 07 Nov 2007
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Location: New York
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Re: DS- Solutions [#permalink]  30 Aug 2008, 05:14
chan4312 wrote:
$$X$$ grams of water were added to the 80 grams of a strong solution of acid. As a result, the concentration of acid in the solution dropped by $$Y$$ percent. What was the concentration of acid in the original solution?

1. $$X = 80$$
2. $$Y = 50$$

1 and 2 itself not suffcient

when you combine..

orignal concentrations c1
concentration after adding water = c2=c1/2

c1=A1/80 c2= A1/80+80 =1/2 c1

No way we can find A1..

Will go for E.

What is OA
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Re: DS- Solutions   [#permalink] 30 Aug 2008, 05:14
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