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.

_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com