15 welders work at a constant rate they complete an order : GMAT Problem Solving (PS)
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

It is currently 09 Dec 2016, 15:53
GMAT Club Tests

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

15 welders work at a constant rate they complete an order

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

Hide Tags

1 KUDOS received
Intern
Intern
avatar
Joined: 27 Mar 2013
Posts: 38
Followers: 0

Kudos [?]: 108 [1] , given: 37

15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 31 May 2013, 21:31
1
This post received
KUDOS
2
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

70% (02:17) correct 30% (01:57) wrong based on 208 sessions

HideShow timer Statistics

15 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?

(A) 5
(B) 2
(C) 8
(D) 4
(E) 6
[Reveal] Spoiler: OA
3 KUDOS received
Current Student
User avatar
Joined: 28 Apr 2012
Posts: 311
Location: India
Concentration: Finance, Technology
GMAT 1: 650 Q48 V31
GMAT 2: 770 Q50 V47
WE: Information Technology (Computer Software)
Followers: 28

Kudos [?]: 380 [3] , given: 142

Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 31 May 2013, 21:54
3
This post received
KUDOS
gmatquant25 wrote:
15 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?

(A)5
(B)2
(C)8
(D)4
(E)6


LCM (15,3,9) = 45

Suppose Total work is 45 Units.

15 Welders = 45 Units / 3 days
15 Welders = 45/3 = 15 Units / day
1 Welder = 1 Unit/day

Day 1: everyone worked = 15 units, remaining 30 Units

After Day 1, I have 6 Welders (15 - 9), and I need to complete 30 Units.

1 Welder = 1 Unit/day
6 Welders = 6 Unit/day

for 30 Units, 30(total units)/ 6 (units per day) = 5 days
Answer A
_________________

"Appreciation is a wonderful thing. It makes what is excellent in others belong to us as well."
― Voltaire


Press Kudos, if I have helped.
Thanks!

4 KUDOS received
Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Joined: 10 Oct 2012
Posts: 631
Followers: 78

Kudos [?]: 1091 [4] , given: 136

Premium Member
Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 31 May 2013, 22:25
4
This post received
KUDOS
1
This post was
BOOKMARKED
gmatquant25 wrote:
15 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?

(A)5
(B)2
(C)8
(D)4
(E)6


\(15*r*3\) = 1 unit of work. Thus, rate of each worker =\(\frac{1}{45}\)
The amount of work done in 1 day with all 15 workers =\(\frac{1}{3}\). The amount of work left to be done by (15-9) workers = \(\frac{2}{3}\)

Let them take d days to complete this work-->\(6*r*d\) = 2/3--> \(6*\frac{1}{45}*d =\frac{2}{3}\)--> d= 5 days.
A.
_________________

All that is equal and not-Deep Dive In-equality

Hit and Trial for Integral Solutions

1 KUDOS received
Moderator
Moderator
User avatar
Joined: 02 Jul 2012
Posts: 1231
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
Followers: 115

Kudos [?]: 1363 [1] , given: 116

Premium Member
Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 31 May 2013, 22:29
1
This post received
KUDOS
gmatquant25 wrote:
15 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?

(A)5
(B)2
(C)8
(D)4
(E)6


Assume the order to be welding 45 rods...

Each welder works at 1 rod per day

On first day 15 rods are completed.

So now 30 rods have to be completed by 6 workers...

So, the answer is 30/6 = 5 days
_________________

Did you find this post helpful?... Please let me know through the Kudos button.

Thanks To The Almighty - My GMAT Debrief

GMAT Reading Comprehension: 7 Most Common Passage Types

Expert Post
1 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 35932
Followers: 6860

Kudos [?]: 90100 [1] , given: 10413

Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 01 Jun 2013, 02:17
1
This post received
KUDOS
Expert's post
gmatquant25 wrote:
15 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?

(A)5
(B)2
(C)8
(D)4
(E)6


Similar question to practice: 6-workers-should-finish-a-job-in-8-days-after-3-days-came-153377.html

Hope it helps.
_________________

New to the Math Forum?
Please read this: 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

Senior Manager
Senior Manager
User avatar
Joined: 17 Dec 2012
Posts: 447
Location: India
Followers: 25

Kudos [?]: 385 [0], given: 14

Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 01 Jun 2013, 20:37
gmatquant25 wrote:
15 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?

(A)5
(B)2
(C)8
(D)4
(E)6


1. We need to find out the time taken by 6 workers after day 1.
2. total no.of wokers * total time taken = time taken by 1 worker
3. Time taken by 1 worker = 15*3 = 45 days
4. But on day 1 fifteen workers had already worked finishing 1/3 of the job. So 6 workers have to finish only 2/3 of the job.
5. Total time taken by 6 workers can be got from formula used at (2). i.e., 6* total time taken = 45. Total time taken by 6 workers to finish the complete job is 45/ 6 = 7.5 days.
6. Time taken by 6 workers to finish 2/3 of the job is 2/3 * 7.5 = 5 days.

The answer is choice A
_________________

Srinivasan Vaidyaraman
Sravna
http://www.sravnatestprep.com

Classroom and Online Coaching

Intern
Intern
avatar
Joined: 06 Aug 2012
Posts: 20
Followers: 0

Kudos [?]: 1 [0], given: 18

Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 29 Jul 2013, 04:48
Hello Brunel is this right approach

Rate of 15 workers = 1/3 job / day
Rate of 1 worker = 1/45 job / day

as 15 workers work for single day and 6 workers work for more days (x)

So now equation becomes

1/3 + 6/45(x-3) = 1
Solving this we get x=8

So 6 workers need x-3more days ie = 5days
Manager
Manager
User avatar
Status: folding sleeves up
Joined: 26 Apr 2013
Posts: 157
Location: India
Concentration: Finance, Strategy
GMAT 1: 530 Q39 V23
GMAT 2: 560 Q42 V26
GPA: 3.5
WE: Consulting (Computer Hardware)
Followers: 1

Kudos [?]: 80 [0], given: 39

Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 08 Sep 2013, 11:33
gmatquant25 wrote:
15 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?

(A) 5
(B) 2
(C) 8
(D) 4
(E) 6



sol:

15 welders rate of job = 1/3

W= 1 (1/3) = 1/3

Remaining Job = 1-(1/3) = 2/3

Job---days---number of welders

2/3------2----------15
2/3------X ---------15-9 = 6


X= 2* (15/6) =5 days
1 KUDOS received
Current Student
avatar
Joined: 03 Aug 2012
Posts: 916
Concentration: General Management, General Management
GMAT 1: 630 Q47 V29
GMAT 2: 680 Q50 V32
GPA: 3.7
WE: Information Technology (Investment Banking)
Followers: 23

Kudos [?]: 676 [1] , given: 322

Premium Member
Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 25 Sep 2013, 19:47
1
This post received
KUDOS
Man Days = Work

15 people * 3 days = 45 units of work

15 people * 1 day = 15 units

Work left = 45 -15 = 30 units

People left to work = 15-9= 6

6 people * x days = 30

x=5
_________________

Rgds,
TGC!
_____________________________________________________________________
I Assisted You => KUDOS Please
_____________________________________________________________________________

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 12904
Followers: 562

Kudos [?]: 158 [0], given: 0

Premium Member
Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 29 Sep 2014, 01:25
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 12904
Followers: 562

Kudos [?]: 158 [0], given: 0

Premium Member
Re: 15 welders work at a constant rate they complete an order [#permalink]

Show Tags

New post 23 Nov 2015, 02:02
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: 15 welders work at a constant rate they complete an order   [#permalink] 23 Nov 2015, 02:02
    Similar topics Author Replies Last post
Similar
Topics:
9 Working alone at their respective constant rates, A can complete a tas Hemavakade 2 08 Sep 2015, 11:20
6 machines working at a constant rate can complete one task saadiagha 2 05 Aug 2014, 09:10
104 Experts publish their posts in the topic Six machines, each working at the same constant rate srkaleem 21 05 Feb 2012, 22:28
33 Experts publish their posts in the topic A welder received an order to make a 1 million liter manalq8 10 16 Jan 2012, 08:59
15 Experts publish their posts in the topic Six machines, each working at the same constant rate zz0vlb 18 26 Apr 2010, 20:53
Display posts from previous: Sort by

15 welders work at a constant rate they complete an order

  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 and phpBB SEO

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®.