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

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Manager
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X grams of water were added to the 80 grams of a strong [#permalink] New post 18 Nov 2008, 10:16
00:00
A
B
C
D
E

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(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficien
Manager
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Re: DS:ACID [#permalink] New post 18 Nov 2008, 11:54
let us assume that originally 80 gms of solution had a gms of acid

Hence from statement 1

we get a/80 - a/160 = y/100 -------equation can t be solved hence insufficient

from 2 we get

a/80 - a/(80+x) = 50/100 = 1/2 --------------again can t be solved insuff

combining can be solved

Hence C
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Re: DS:ACID [#permalink] New post 19 Nov 2008, 09:15
I would go with E..we dont know the original concentration..
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Re: DS:ACID [#permalink] New post 19 Nov 2008, 21:34
taking stmts 1 and 2 in consideration and the given statements the solution is

a 100% solution of srong acid (all 80 gms is acid) reduces in concetration to 50 % ( 80 gm acid + 80 gms water)

Hence C
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Re: DS:ACID [#permalink] New post 20 Nov 2008, 09:48
Even i would go with E.
We do not know the original concentration of the acid.Strong does not mean concentration is 100%.
Re: DS:ACID   [#permalink] 20 Nov 2008, 09:48
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