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Two questions from OG 12 Edition
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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
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06 Apr 2009, 17:51
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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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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.