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A new cell phone plan is offering pricing based on average

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Director
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A new cell phone plan is offering pricing based on average [#permalink] New post 26 Dec 2007, 08:33
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A
B
C
D
E

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(N/A)

Question Stats:

100% (02:24) correct 0% (00:00) wrong based on 2 sessions
A new cell phone plan is offering pricing based on average monthly use. Brandon and Jodie are comparing their average use to determine the best plan for them. Brandon's average monthly usage in 2001 was q minutes. Was this less than, greater than, or equal to Jodie's 2001 average monthly usage, in minutes?
(1) From January to August 2001, Jodie's average monthly usage was 1.5q minutes.

(2) From April to December 2001, Jodie's average monthly usage was 1.5q minutes.
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 [#permalink] New post 26 Dec 2007, 08:57
I think it is C.

1) INSUF. The Average is 1.5 q for 8 months, that is a total of 12 q for the 8 months. Nevertheless, we do not know anytthing aaboy the balance months. So INS.

2) The same. INS.

But taken together, we have all the information to solve the problem.

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 [#permalink] New post 26 Dec 2007, 16:57
is statement 2 supposed to say from august to december, instead of april to december ?

in any case, with statement 1, we are trying to basically find whether :

(12q+x)/12 > q ... where x is the usage for the remaining 4 months. We can simplify this to ask is x>0 ?

I initially thought A was enough to solve, but then I forgot to consider that for the remaining 4 months, the usage could be 0 minutes.
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Re: DS: Averages [#permalink] New post 24 Oct 2009, 11:48
Hi there,

I would also say the correct answer should be C. However, the official MGMAT answer is B (I got this questions from the weekly question bank). Any idea why this is?

Best
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Re: DS: Averages [#permalink] New post 06 Nov 2009, 17:34
Correct answer is indeed B.

Ben's monthly average = q
Therefore, the sum equals 12q

Now, if we can proof that Jodie's usage per year was higher than Ben's, we answered the question.

(1) Insufficient since only eight month (1.5q * 8 = 12q - for the whole year it could be higher than 12)
(2) Sufficient since we are looking at a 9 month period (1.5q * 9 > 12q)
Re: DS: Averages   [#permalink] 06 Nov 2009, 17:34
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