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

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Joined: 04 Jun 2008
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X grams of water were added to the 80 grams of a strong [#permalink]

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30 Aug 2008, 05:27
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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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30 Aug 2008, 06:14
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: X grams of water were added to the 80 grams of a strong [#permalink]

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02 Aug 2017, 17:09
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: X grams of water were added to the 80 grams of a strong   [#permalink] 02 Aug 2017, 17:09
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