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Two questions from OG 12 Edition

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Two questions from OG 12 Edition [#permalink]

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05 Apr 2009, 21:29
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I was wondering if there is a typo in Problem Solving Answer Explanations for questions 148 and 230. Please remember these questions are from OG 12 Edition.

In Q 148: How did they get y in (10(x+y) + 10y) / (x +y)? Please note this is the third step in the answer.
In Q 230: The answer explanation said 2^17 instead of 2^-17. Is this right?
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Re: Two questions from OG 12 Edition [#permalink]

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06 Apr 2009, 17:51
GMAT_700 wrote:
I was wondering if there is a typo in Problem Solving Answer Explanations for questions 148 and 230. Please remember these questions are from OG 12 Edition.

In Q 148: How did they get y in (10(x+y) + 10y) / (x +y)? Please note this is the third step in the answer.
In Q 230: The answer explanation said 2^17 instead of 2^-17. Is this right?

In Q148: That is not a typo. The numerator in the previous line is 10x + 20y; we can rewrite this as follows:

10x + 20y = 10x + 10y + 10y = 10(x + y) + 10y

That said, I find their solution to be quite awkward to this problem

In Q230: I don't see a typo here either. In the third line of the solved equation, they are dividing by 2^(-17). That's the same as dividing by 1/2^17, which is the same as multiplying by 2^17. I think that's the part of the solution you're referring to? Again, their solution is a bit awkward.
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Re: Two questions from OG 12 Edition   [#permalink] 06 Apr 2009, 17:51
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