It is currently 20 Oct 2017, 06:09

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Of the companies surveyed about the skills they required in

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 41890

Kudos [?]: 128967 [0], given: 12185

### Show Tags

25 Jun 2012, 03:08
Expert's post
32
This post was
BOOKMARKED
00:00

Difficulty:

35% (medium)

Question Stats:

70% (01:47) correct 30% (01:47) wrong based on 1040 sessions

### HideShow timer Statistics

Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of the companies surveyed required neither computer skills nor writing skills?

(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but not computer skills.

Diagnostic Test
Question: 34
Page: 25
Difficulty: 700
[Reveal] Spoiler: OA

_________________

Kudos [?]: 128967 [0], given: 12185

Math Expert
Joined: 02 Sep 2009
Posts: 41890

Kudos [?]: 128967 [4], given: 12185

Re: Of the companies surveyed about the skills they required in [#permalink]

### Show Tags

29 Jun 2012, 05:18
4
KUDOS
Expert's post
7
This post was
BOOKMARKED
SOLUTION

Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of the companies surveyed required neither computer skills nor writing skills?

(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but not computer skills.

You can draw a Venn diagram or make a matrix to solve this question.

Note that statement (1) says that "of those companies surveyed that required computer skills, half required writing skills" --> if $$y$$ required computer skills, then of those $$y$$ who required computer skills, $$\frac{y}{2}$$ also required writing skills (# of companies required computer and writing skills is $$\frac{y}{2}=20$$).
Attachment:

Skills.JPG [ 52.83 KiB | Viewed 12127 times ]

_________________

Kudos [?]: 128967 [4], given: 12185

Senior Manager
Joined: 22 Dec 2011
Posts: 294

Kudos [?]: 296 [0], given: 32

Re: Of the companies surveyed about the skills they required in [#permalink]

### Show Tags

16 Nov 2012, 05:58
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of the companies surveyed required neither computer skills nor writing skills?

(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but not computer skills.

Diagnostic Test
Question: 34
Page: 25
Difficulty: 700

GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!

Hi Bunuel - Im not able to access the below link. Im getting an error message that reads "you are NOT authorized"

The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Cheers

Kudos [?]: 296 [0], given: 32

Math Expert
Joined: 02 Sep 2009
Posts: 41890

Kudos [?]: 128967 [0], given: 12185

Re: Of the companies surveyed about the skills they required in [#permalink]

### Show Tags

14 Aug 2013, 02:14
Bumping for review and further discussion.

All OG13 questions are here: the-official-guide-quantitative-question-directory-143450.html
_________________

Kudos [?]: 128967 [0], given: 12185

Intern
Joined: 15 Sep 2013
Posts: 5

Kudos [?]: 1 [0], given: 55

Re: Of the companies surveyed about the skills they required in [#permalink]

### Show Tags

05 Mar 2014, 13:47

Strategy: Find out both "JUST" computer skills and "JUST" writing skills, SUM them. Take that SUM and subtract from 100% (Total possible) to reach the "neither" of those 2 possibilities.

From stem: 20% require both computer skills and writing skills (helps us ascertain "JUST" computer skills" in statement 1.
From (1): 2 * 20% require JUST computer skills -> 40% for JUST computer skills but don't know about writing skills - N.S.
From (2): 45% require JUST writing skills -> 45% for JUST writing skills but don't know about computer skills - N.S
(1 + 2) Now know both "JUST" computer skills & writing skills. If you add these up you get 85% with no overlap. Subtract this from 100% (total possible) to reach 15% as neither. Sufficient.

Kudos [?]: 1 [0], given: 55

Manager
Joined: 20 Apr 2014
Posts: 116

Kudos [?]: [0], given: 23

Re: Of the companies surveyed about the skills they required in [#permalink]

### Show Tags

15 Mar 2016, 04:16
Hi Bunuel

Can I solve this DS question by the overlapping formula step by step to discover which statement provides required info or both or none ?

Kudos [?]: [0], given: 23

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7676

Kudos [?]: 17365 [3], given: 232

Location: Pune, India
Re: Of the companies surveyed about the skills they required in [#permalink]

### Show Tags

15 Mar 2016, 09:32
3
KUDOS
Expert's post
1
This post was
BOOKMARKED
Bunuel wrote:
Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of the companies surveyed required neither computer skills nor writing skills?

(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but not computer skills.

Diagnostic Test
Question: 34
Page: 25
Difficulty: 700

Think of the Venn Diagram. You are given that the overlap area has 20 companies (assuming total 100 companies) in the question stem.

(1) Of those companies surveyed that required computer skills, half required writing skills.
So half of the companies that required computer skills, required writing skills too. Hence this 20 forms half of the companies that required computer skills. So total 40 companies required computer skills. The info given in red is obtained by using statement 1. We don't know how many required only writing skills yet so we cannot find none. Not sufficient.

(2) 45 percent of the companies surveyed required writing skills but not computer skills.
Now we know that 45 required only writing skills. The info in green is obtained by statement 2. But we don't know how many required only computer skills so not sufficient.

Attachment:

Overlapping sets.jpg [ 25.44 KiB | Viewed 4504 times ]

Using both, we have all the data.

None = 100 - 20 - 20 - 45 = 15

_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for \$199

Veritas Prep Reviews

Kudos [?]: 17365 [3], given: 232

Senior Manager
Status: Professional GMAT Tutor
Affiliations: AB, cum laude, Harvard University (Class of '02)
Joined: 10 Jul 2015
Posts: 404

Kudos [?]: 479 [0], given: 53

Location: United States (CA)
Age: 37
GMAT 1: 770 Q47 V48
GMAT 2: 730 Q44 V47
GMAT 3: 750 Q50 V42
GRE 1: 337 Q168 V169
WE: Education (Education)
Re: Of the companies surveyed about the skills they required in [#permalink]

### Show Tags

27 Mar 2016, 19:18
Here is a visual that should help.
Attachments

Screen Shot 2016-03-27 at 7.17.12 PM.png [ 97.7 KiB | Viewed 4362 times ]

_________________

Harvard grad and 770 GMAT scorer, offering high-quality private GMAT tutoring, both in-person and via Skype, since 2002.

McElroy Tutoring

Kudos [?]: 479 [0], given: 53

Director
Joined: 12 Nov 2016
Posts: 784

Kudos [?]: 35 [0], given: 164

### Show Tags

21 Mar 2017, 23:02
Bunuel wrote:
Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of the companies surveyed required neither computer skills nor writing skills?

(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but not computer skills.

Diagnostic Test
Question: 34
Page: 25
Difficulty: 700

This question asks us if we have enough information to determine what percent of the companies surveyed require neither computer skills nor writing- if we think of this question as a Venn Diagram then circle A can be the percent of companies that require writing skills, circle b can be the percent of companies that require computer skills, the intersection of circle a and b ( circle c if you will) is the percent of companies that require both, and a circle separate from these three circles, circle D, can be the percent of companies that require neither ( see set theory). If we know the percentage of A B and C then we can calculate what the percentage of circle D will be ( Total= A + B - both + neither).

Statement (1) tells us that half of the companies that required computer skills require writing skills; this implies that the percentage of c will be half of b- if the percentage of companies that required computer skills were say 60 percent- then the percentage of companies that require both would be 30 percent according to this statement. However, we cannot calculate the percentage of companies that require writing skills only from this statement and therefore we cannot calculate the percentage that require neither. Insufficient.

Statement (2) gives us the total percentage of companies that require writing skills- if 45 percent require only writing skills then the percentage of A is 65 ( see set theory). However, this leaves us with the same problem as statement (1) - we cannot find out the percentage of "B." Insufficient.

Statement (1) and Statement (2) allow us to calculate the percentage of A, B and C and thus solve for D. Sufficient
Total= 45% + 40% - 20% + D (We can just assume these are values of 100 for the sake of convenience though algebra may be more appropriate in other circumstances)
100= 45+ 40- 20 + D
100= 85-20+D
100=65+D
35=D

Kudos [?]: 35 [0], given: 164

Of the companies surveyed about the skills they required in   [#permalink] 21 Mar 2017, 23:02
Display posts from previous: Sort by