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 Post subject: GMAT Data AnalysisPosted: Sat Jul 10, 2010 6:47 am

Joined: Sun May 30, 2010 3:15 am
Posts: 424

A computer retailer sells only TFT and LCD style monitors. According to the graph above, where the x-axis represents the day of the week and the y-axis represents the number of monitors sold, on which day was the ratio of the number of LCD monitors sold to total number of monitors sold the greatest?
A. Monday
B. Tuesday
C. Wednesday
D. Thursday
E. Friday

(C) The number of LCD sales is the difference between total sales and TFT sales. For each day of the week, we can determine the ratio of the number of LCD monitors sold to the total number of monitors sold:
Monday: (18 – 10)/18 = 4/9
Tuesday: (22 – 12)/22 = 5/11
Wednesday: (24 – 12)/24 = 1/2
Thursday: (26 – 16)/26 = 5/13
Friday: (26 – 14)/26 = 6/13.

The greatest fraction is 1/2, so the ratio on Wednesday is the largest.The correct answer is choice (C).
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* let L represent the number of LCD monitors sold
* let T represent the number of TFT monitors sold
Why is the ratio calculated as (L-T)/L? I would expect it to be L/(L+T).

Thanks

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 Post subject: Re: math (test 2, question 9): data analysisPosted: Sat Jul 10, 2010 6:53 am

Joined: Sun May 30, 2010 2:23 am
Posts: 498

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 Post subject: Re: GMAT Data AnalysisPosted: Fri Jul 27, 2012 2:36 am

Joined: Sun May 30, 2010 3:15 am
Posts: 424
How is half the largest share? Its equal for both LCD and TFT.

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 Post subject: Re: GMAT Data AnalysisPosted: Fri Jul 27, 2012 2:44 am

Joined: Sun May 30, 2010 2:23 am
Posts: 498

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 Post subject: Re: GMAT Data AnalysisPosted: Sun Aug 04, 2013 8:30 am

Joined: Sun May 30, 2010 3:15 am
Posts: 424
Hi there.

When the question asks for the greatest ratio, I thought that it might have been one of the others, 1/2 is the largest number but the difference between the two values isn't the biggest. e.g. for every 1 of a there is 2 of b. But with other ans it was for every 4 of a there is 9 of b. Just so I fully understand, could you please explain ways to fully understand what's being asked in the gmat, because I got the maths right, just misinterpreted. Thanks.

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 Post subject: Re: GMAT Data AnalysisPosted: Sun Aug 04, 2013 8:40 am

Joined: Sun May 30, 2010 2:23 am
Posts: 498

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