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M10-23

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Re: M10-23  [#permalink]

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New post 18 Feb 2018, 17:44
Hi Bunuel/Others

I tried solving by this,

Let initial weight of acid in the solution = a gm
So initial conc. of acid = a/80

As per statement 1: Total weight of acid now = 80 gm +80 gm.
So new conc. of acid = a/160

As per question stem: a/(160)=(1/Y)*(a/80)
If we solve the above equation we get Y=2.
But we need to find value of a in order to get a/80.
So this is insufficient.

As per statement 2: Y=2, Insufficient.

Both together same result i.e. insufficient.

Can someone validate the approach? Thanks.
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New post 29 Apr 2018, 02:11
I think this is a high-quality question and the explanation isn't clear enough, please elaborate.
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New post 22 May 2018, 20:25
Bunuel you should try explaining the solutions more thoroughly. We are paying for this service and a lot of questions are answered in a very poor way.
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Re: M10-23  [#permalink]

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New post 22 May 2018, 21:30
mariobc90 wrote:
Bunuel you should try explaining the solutions more thoroughly. We are paying for this service and a lot of questions are answered in a very poor way.


Check more solutions here: http://gmatclub.com/forum/x-grams-of-wa ... 73028.html

Hope it helps.
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Re M10-23  [#permalink]

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New post 10 Jun 2018, 22:16
I think this is a high-quality question and I agree with explanation. Great question. Really tests your ability to solve for the correct variable. The question is asking for the concentration of Acid (i.e. what is Acid/80). Each statement gives you enough info to solve for X/Y, but have these 2 variables by themselves do not give you A/80 (try to find A/80; you can't with the given info).
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Re: M10-23  [#permalink]

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New post 01 Oct 2018, 11:24
Question language is misleading. Should be edited. Should read "added to 80 grams of acid in a solution." or "added to a solution mixture that contained 80 grams of acid."

The GMAT doesn't use misleading language to try and trick test takers (only reason this is HARD - 95%) This question isn't testing quantitative skill or concepts.
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Re: M10-23 &nbs [#permalink] 01 Oct 2018, 11:24

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