It is currently 15 Dec 2017, 08:17

Decision(s) Day!:

CHAT Rooms | Olin (St. Louis) R1 | Tuck R1 | Ross R1 | Fuqua R1


Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

In 1995 Division A of company had 4850 customers. If there

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
avatar
Joined: 01 Jul 2010
Posts: 53

Kudos [?]: 62 [0], given: 15

Schools: LBS, Harvard, Booth, Stanford, ISB, NTU
WE 1: S/W Engineer
In 1995 Division A of company had 4850 customers. If there [#permalink]

Show Tags

New post 20 Aug 2010, 00:58
3
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

49% (01:35) correct 51% (01:30) wrong based on 131 sessions

HideShow timer Statistics

In 1995 Division A of company had 4850 customers. If there were 86 service errors in Division A that year, what was service-error rate, in number of service errors per 100 customers, for Division B of Company X in 1995?

(1) In 1995 the overall service-error rate for Division A and B combined was 1,5 errors per 100 customers.
(2) In 1995 Division B had 9,350 customers, none of whom were customers of Division A
[Reveal] Spoiler: OA

Attachments

Untitled.jpg
Untitled.jpg [ 139.63 KiB | Viewed 2909 times ]

Kudos [?]: 62 [0], given: 15

Expert Post
2 KUDOS received
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42615

Kudos [?]: 135739 [2], given: 12707

Re: GMAT prep [#permalink]

Show Tags

New post 20 Aug 2010, 03:39
2
This post received
KUDOS
Expert's post
5
This post was
BOOKMARKED
In 1995 Division A of the company had 4850 customers, If there were 86 servise errors in Division A that year,what was servise error rate, in number of servise errors per 100 customers in Division B of the company in 1995?

Question \(\frac{x}{B}100=?\) Where x is the servise errors in Division B and B is # of customers of division B.

(1) In 1995 the overall service error rate for Division A and B combined was 1,5 errors per 100 customers.

\(\frac{86+x}{4850+B}=\frac{1.5}{100}\), two variables one equation - can not solve for variables. Also can not get the ratio needed. Not sufficient.

(2) IN 1995 division B had 9350 customers, non of whom were customers for division A

B=9350, clearly insufficient.

(1)+(2) We know the value of B, hence we can calculate x, from (1) and the fraction \(\frac{x}{B}\). Sufficient.

Answer: C.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135739 [2], given: 12707

Intern
Intern
User avatar
Joined: 14 Jul 2010
Posts: 48

Kudos [?]: 4 [0], given: 5

Schools: CMU Tepper
Re: in 1995 a division of a company x [#permalink]

Show Tags

New post 17 Nov 2010, 07:24
Rephrase the question:

Is there sufficient info to know the ratio of errors to customers in division B, if the error ratio for division A is already known?

Statement 1: The Ratio for the two divisions combined is insufficient, because I don't know how much customer overlap there is.

Statement 2: The number of customers in Division B is insufficient because I don't know how many errors there are.

However statement 2 adds that there is no customer overlap, so if I combine the two statements there is sufficient info.

The answer is C

Kudos [?]: 4 [0], given: 5

Intern
Intern
User avatar
Joined: 14 Jul 2010
Posts: 48

Kudos [?]: 4 [0], given: 5

Schools: CMU Tepper
Re: GMAT prep [#permalink]

Show Tags

New post 17 Nov 2010, 07:34
Bunuel wrote:
[b]
(1) In 1995 the overall service error rate for Division A and B combined was 1,5 errors per 100 customers.

\(\frac{86+x}{4850+B}=\frac{1.5}{100}\), two variables one equation - can not solve for variables. Also can not get the ratio needed. Not sufficient.


In a ratio question, two variables and one equation, can be solved. The issue here is that you cannot simply add the customers of division a and b if you don't know how many overlap

Kudos [?]: 4 [0], given: 5

Expert Post
1 KUDOS received
Veritas Prep GMAT Instructor
User avatar
G
Joined: 16 Oct 2010
Posts: 7800

Kudos [?]: 18136 [1], given: 236

Location: Pune, India
Re: GMAT prep [#permalink]

Show Tags

New post 17 Nov 2010, 11:14
1
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
dwiesenfeld wrote:
Bunuel wrote:
[b]
(1) In 1995 the overall service error rate for Division A and B combined was 1,5 errors per 100 customers.

\(\frac{86+x}{4850+B}=\frac{1.5}{100}\), two variables one equation - can not solve for variables. Also can not get the ratio needed. Not sufficient.


In a ratio question, two variables and one equation, can be solved. The issue here is that you cannot simply add the customers of division a and b if you don't know how many overlap


Two variables and one equation can be solved for ratio of the variables only when there is no constant term getting added or subtracted.
An equation like \(x + 4850B = 1.5x\) can be solved for ratio of x and B. But an equation like \(\frac{86+x}{4850+B}=\frac{1.5}{100}\) cannot be.
The issue here is that you do not have the number of customers of division B. Since the average is weighted, you need to have the number of customers of B to get the error rate of division B. (and in case there is an overlap, then you also need the number of services which were provided together by division A and B and also the overlap in the errors)
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Kudos [?]: 18136 [1], given: 236

Intern
Intern
avatar
B
Joined: 29 Mar 2015
Posts: 10

Kudos [?]: [0], given: 1

In 1995 Division A of company had 4850 customers. If there [#permalink]

Show Tags

New post 29 Nov 2017, 06:39
Bunuel wrote:
In 1995 Division A of the company had 4850 customers, If there were 86 servise errors in Division A that year,what was servise error rate, in number of servise errors per 100 customers in Division B of the company in 1995?

Question \(\frac{x}{B}100=?\) Where x is the servise errors in Division B and B is # of customers of division B.

(1) In 1995 the overall service error rate for Division A and B combined was 1,5 errors per 100 customers.

\(\frac{86+x}{4850+B}=\frac{1.5}{100}\), two variables one equation - can not solve for variables. Also can not get the ratio needed. Not sufficient.

(2) IN 1995 division B had 9350 customers, non of whom were customers for division A

B=9350, clearly insufficient.

(1)+(2) We know the value of B, hence we can calculate x, from (1) and the fraction \(\frac{x}{B}\). Sufficient.

Answer: C.


Hi Bunuel
The overall service error rate for Division A and B combined was 1,5 errors per 100 customers. Can we just plus the (error rate A/customer A) + (error rate B/customer B)?
Could you please explain?

Kudos [?]: [0], given: 1

In 1995 Division A of company had 4850 customers. If there   [#permalink] 29 Nov 2017, 06:39
Display posts from previous: Sort by

In 1995 Division A of company had 4850 customers. If there

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.