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What is the ratio of the average to the sum of numbers in

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Manager
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What is the ratio of the average to the sum of numbers in [#permalink] New post 21 Sep 2007, 06:14
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Q. What is the ratio of the average to the sum of numbers in series S?
1) Sum of the numbers is 50
2) There are 10 numbers in the series

Please explain your answer.
Director
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 [#permalink] New post 21 Sep 2007, 06:43
HI
Stmnt A) (50/n)/50=n where n represents the number of the numbers in the series S , so Stmnt A is NOT suff

STMNT B- (S/10)/S=1/10 where S is the SUM of the numbers in the series so Stmnt B is SUFF

Ans:B
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 [#permalink] New post 21 Sep 2007, 08:59
Totally Agree with BG, it is B.

It is always useful to simplify the given or asked expression in the question itself before going through statements.

Ans: B
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Re: DS: Trap [#permalink] New post 21 Sep 2007, 09:03
financeguy wrote:
Q. What is the ratio of the average to the sum of numbers in series S?
1) Sum of the numbers is 50
2) There are 10 numbers in the series

Please explain your answer.


Joe Bloggs question !
You just need to know how many numbers are there Avg = Sum/ N .What is asked Avg/Sum . And than is 1/N
So B.
Director
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Re: DS: Trap [#permalink] New post 21 Sep 2007, 15:17
financeguy wrote:
Q. What is the ratio of the average to the sum of numbers in series S?
1) Sum of the numbers is 50
2) There are 10 numbers in the series

Please explain your answer.


got B! it is helpful to rephrase this question before looking at stmt 1 and 2. You will realize all you want to find is 1/n.
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 [#permalink] New post 21 Sep 2007, 17:39
B is the OA. Well done everybody because according to the book I picked this question from, more than 99% student will have this question wrong on GMAT.
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Re: DS: Trap [#permalink] New post 21 Sep 2007, 17:52
financeguy wrote:
Q. What is the ratio of the average to the sum of numbers in series S?
1) Sum of the numbers is 50
2) There are 10 numbers in the series

Please explain your answer.


Ans is B.

The normal equation is for sum/average/ etc... is written

Sum/# of terms= Average --> S/#=A. Since we are looking for A/S just rework the equation.

1/#=A/S.

S1: Tells us the Sum, but we can't determine the ratio of A/S here.

S2: gives us 1/10=A/S

Suff.
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 [#permalink] New post 29 Sep 2007, 12:48
financeguy wrote:
B is the OA. Well done everybody because according to the book I picked this question from, more than 99% student will have this question wrong on GMAT.

These kind of books just try to make u feel special.
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Re: DS: Trap [#permalink] New post 30 Sep 2007, 16:49
Fistail wrote:
ashkrs wrote:
financeguy wrote:
Q. What is the ratio of the average to the sum of numbers in series S?
1) Sum of the numbers is 50
2) There are 10 numbers in the series

Please explain your answer.


Joe Bloggs question !
You just need to know how many numbers are there Avg = Sum/ N .What is asked Avg/Sum . And than is 1/N
So B.



B. who is Joe Bloggs?


Joe Bloggs is a fictional character from Pricenton Review in theie book.
This is a cut and paste of this guy's character.
"Joe Bloggs is an average American prospective business school student .He has average grades in college and he will get average grade in GMAT. There's little bit on him in everyone , and there's little bit of everyone in him.He isn't brilliant .He isn't dumb .He's just average."

In short he is a guy who most of the time falls in the trap!
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 [#permalink] New post 01 Oct 2007, 01:12
St1:
We do not have the average nor the # of elements in the series. Insufficient.

St2:
If sum = x, then average = x/10 and ratio = 1/10. Sufficient.

Ans B
  [#permalink] 01 Oct 2007, 01:12
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