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Carolyn and Brett - nicely explained what is the typical day of a UCLA student. I am posting below recording of the webinar for those who could't attend this session.

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project: 1. Please provide your solutions to the questions; 2. Please vote for the best solutions by pressing Kudos button; 3. Please vote for the questions themselves by pressing Kudos button; 4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

If l and w represent the length and width, respectively, of the rectangle above, what is the perimeter?

(1) 2l + w = 40 (2) l + w = 25

Target question:What is the perimeter? This is a great candidate for REPHRASING the target question.

Aside: We have a free video with tips on rephrasing the target question (see below)

If L and W represent the rectangle's length and width, then the perimeter = 2L + 2W. So, we can REPHRASE the target question as...

REPHRASED target question:What is the value of 2L + 2W?

Statement 1: 2L + W = 40 This statement does not FEEL sufficient to answer the rephrased target question. So, I'm going to PLUG IN numbers. There are several values of L and W that satisfy statement 1. Here are two: Case a: L = 5 and W = 30, in which case 2L + 2W = 70 Case b: L = 10 and W = 20, in which case 2L + 2W = 60 Since we cannot answer the REPHRASED target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: L + W = 25 If we take this equation and multiply both sides by 2, we get: 2L + 2W = 50 PERFECT - we have answered the REPHRASED target question! Since we can answer the REPHRASED target question with certainty, statement 2 is SUFFICIENT

Answer: B

Cheers, Brent

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Re: If l and w represent the length and width, respectively, of &nbs
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19 Apr 2018, 14:02