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11 Jul 2016, 03:51
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
60% (02:50) correct
40%
(01:47)
wrong
based on 5
sessions
History
Date
Time
Result
Not Attempted Yet
The teacher asked a student to write forst few natural numbers on the board.
By mistake, the student wrote a number twice. If the average of all numberson the board is 28 (2/7). Whatis the number which is written twice?
(A)12
(B)16
(C)28
(D)44
(E)none
Tia
By mistake, the student wrote a number twice. If the average of all numberson the board is 28 (2/7). Whatis the number which is written twice?
(A)12
(B)16
(C)28
(D)44
(E)none
Tia
This Question is Locked Due to Poor Quality
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11 Jul 2016, 12:05
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samratpahwa
Dear Tia,
I'm happy to respond.
My friend, I am not sure what the source of this question is, but it is definitely not a GMAT practice question. It is loaded with typos, the wording is unclear, and so far as I can tell, there's nothing particularly elegant about the solution. First of all, here is what the prompt is trying to say:
The teacher asked a student to write all the natural numbers from 1 to n on the board. By mistake, the student wrote a number twice, so that there was a total of (n +1) numbers on the board. If the average of all numbers on the board is \(28\frac{2}{7}\), what is the number that was written twice?
That's a grammatically correct and unambiguous statement of the question itself. This question seems to rely on guess-and-check strategies, and it would have been quite laborious without a calculator. This is way out-of-scope of anything the GMAT would ask.
If you found this in a book that claims to be preparing you for the GMAT, burn that book.
If this is a question you created, I would say it's very important to understand the subtle constraints of a good GMAT Quant question. A poorly conceived question involves a laborious calculation. A well conceived question may look as if it requires a long calculation, but it can be solve quickly with an elegant shortcut. Keep this in mind as you think about GMAT Quant questions.
Does all this make sense?
Mike
11 Jul 2016, 12:32
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mikemcgarry, very well said.
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