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

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Manager
Joined: 24 Jul 2007
Posts: 197
What is the ratio of the average to the sum of numbers in [#permalink]

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21 Sep 2007, 07:14
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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

Director
Joined: 13 Nov 2003
Posts: 789
Location: BULGARIA

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21 Sep 2007, 07:43
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
Senior Manager
Joined: 27 Aug 2007
Posts: 253

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21 Sep 2007, 09:59
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
Director
Joined: 08 Jun 2007
Posts: 573

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21 Sep 2007, 10:03
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

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
Joined: 11 Jun 2007
Posts: 914

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21 Sep 2007, 16:17
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

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.
Manager
Joined: 24 Jul 2007
Posts: 197

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21 Sep 2007, 18:39
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.
CEO
Joined: 29 Mar 2007
Posts: 2559

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21 Sep 2007, 18:52
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

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.
Director
Joined: 18 Jul 2006
Posts: 524

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29 Sep 2007, 13:48
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.
Director
Joined: 08 Jun 2007
Posts: 573

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30 Sep 2007, 17:49
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

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!
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5043
Location: Singapore

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01 Oct 2007, 02:12
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
01 Oct 2007, 02:12
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