GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Aug 2019, 17:51

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

Factory line A assembles materials and makes leather bags at a rate of

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

Hide Tags

Find Similar Topics 
Manager
Manager
avatar
P
Joined: 10 Oct 2018
Posts: 203
GPA: 4
Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post Updated on: 19 Aug 2019, 03:15
2
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

62% (01:29) correct 38% (01:45) wrong based on 93 sessions

HideShow timer Statistics

Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags?

(A) 5
(B) 11
(C) 250
(D) 300
(E) 360

_________________
Kudos OK Please!!

Originally posted by EncounterGMAT on 31 Jul 2019, 01:19.
Last edited by Bunuel on 19 Aug 2019, 03:15, edited 2 times in total.
Manager
Manager
avatar
S
Joined: 25 Jul 2018
Posts: 192
CAT Tests
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 31 Jul 2019, 01:36
1
1
A—25 bags/hour
B—30 bags/hour

A started producing an hour earlier than B

25t+ 25= 30t
t = 5 hours
5 *60 minutes = 300

The answer choice is D

Posted from my mobile device
Intern
Intern
avatar
Joined: 31 Jul 2019
Posts: 1
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 04 Aug 2019, 23:35
Answer can be solved by logic.

The first machine starts its production an hour prior to the second machine but is comparatively slower than the second one.

At 6 hours, Machine A would have produced 25x6= 150
Machine B having started an hour later would have produced only for 5 hours, 5x30=150

So at 360 minutes both the machine would have the same production.
Director
Director
User avatar
V
Joined: 27 May 2012
Posts: 838
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 06 Aug 2019, 08:38
lacktutor wrote:
A—25 bags/hour
B—30 bags/hour

A started producing an hour earlier than B

25t+ 25= 30t
t = 5 hours
5 *60 minutes = 300

The answer choice is D

Posted from my mobile device


Hi lacktutor,
Why is the answer not coming this way 25t= 30(t-1)
25t=30t-30
5t=30 ,t=6

Shouldn't the answer come this way too.
_________________
- Stne
Manager
Manager
avatar
S
Joined: 25 Jul 2018
Posts: 192
CAT Tests
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 06 Aug 2019, 09:16
stne wrote:
lacktutor wrote:
A—25 bags/hour
B—30 bags/hour

A started producing an hour earlier than B

25t+ 25= 30t
t = 5 hours
5 *60 minutes = 300

The answer choice is D

Posted from my mobile device


Hi lacktutor,
Why is the answer not coming this way 25t= 30(t-1)
25t=30t-30
5t=30 ,t=6

Shouldn't the answer come this way too.


Why not??

But, you need to calculate it correctly. The question is asking the total time after B starts, not A.
In your case, (t-1) is the right one.
—> 6-1=5 or 300 minutes.

Hope it helps
Director
Director
User avatar
V
Joined: 27 May 2012
Posts: 838
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 06 Aug 2019, 10:38
lacktutor wrote:
stne wrote:
lacktutor wrote:
A—25 bags/hour
B—30 bags/hour

A started producing an hour earlier than B

25t+ 25= 30t
t = 5 hours
5 *60 minutes = 300

The answer choice is D

Posted from my mobile device


Hi lacktutor,
Why is the answer not coming this way 25t= 30(t-1)
25t=30t-30
5t=30 ,t=6

Shouldn't the answer come this way too.


Why not??

But, you need to calculate it correctly. The question is asking the total time after B starts, not A.
In your case, (t-1) is the right one.
—> 6-1=5 or 300 minutes.

Hope it helps


Hi lacktutor,

Where in the question does it say total time taken by B?
_________________
- Stne
Intern
Intern
avatar
B
Joined: 13 Mar 2019
Posts: 27
CAT Tests
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 06 Aug 2019, 11:10
2
The relative rate of Factory B is (30 - 25) = 5 bags/hr
and Since the factory B starts after an hour it justs have to outweight whatever A made in an hour which is 25 bags
So 25/rel rate = 25/5 = 5 hrs = 300 min.
Intern
Intern
avatar
B
Joined: 29 Jul 2019
Posts: 20
Location: United States (NJ)
GMAT 1: 750 Q49 V44
GPA: 3.51
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 06 Aug 2019, 12:15
DarshanK, since the question asks "In how many minutes" it implies that it is asking only for the time from 'now', which is when B starts running. Thus, it's not the total time but t-1hr or 300 minutes. It could be written more clearly.
Target Test Prep Representative
User avatar
D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 7399
Location: United States (CA)
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 11 Aug 2019, 19:49
EncounterGMAT wrote:
Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags?
(A) 5
(B) 11
(C) 250
(D) 300
(E) 360


Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation:

25(n + 1) = 30n

25n + 25 = 30n

25 = 5n

5 = n

So, the same number of bags are produced in 5 x 60 = 300 minutes.

Answer: D
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Manager
Manager
avatar
B
Joined: 27 Jun 2015
Posts: 50
GRE 1: Q158 V143
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 11 Aug 2019, 20:12
1
ScottTargetTestPrep wrote:
EncounterGMAT wrote:
Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags?
(A) 5
(B) 11
(C) 250
(D) 300
(E) 360


Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation:

25(n + 1) = 30n

25n + 25 = 30n

25 = 5n

5 = n

So, the same number of bags are produced in 5 x 60 = 300 minutes.

Answer: D


Hi,

As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take.

So if we calculate the numbers of factory line A has worked is 360 mins.

Seems like this question is poorely written.

Both 360 and 300 can be the ans depending upon the inference of a test taker

Posted from my mobile device
Director
Director
User avatar
V
Joined: 27 May 2012
Posts: 838
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 19 Aug 2019, 03:09
1
vishumangal wrote:
ScottTargetTestPrep wrote:
EncounterGMAT wrote:
Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags?
(A) 5
(B) 11
(C) 250
(D) 300
(E) 360


Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation:

25(n + 1) = 30n

25n + 25 = 30n

25 = 5n

5 = n

So, the same number of bags are produced in 5 x 60 = 300 minutes.

Answer: D


Hi,

As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take.

So if we calculate the numbers of factory line A has worked is 360 mins.

Seems like this question is poorely written.

Both 360 and 300 can be the ans depending upon the inference of a test taker

Posted from my mobile device


Hi vishumangal,
You are correct
That was precisely my query, one should be honest about one's reply rather than formulate the explanation to suit the OA.
IMO there is no way we can be sure whether total time from beginning or time taken after B starts , is being asked for here.
if any moderator can correct me , I would be grateful.
_________________
- Stne
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 57155
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 19 Aug 2019, 03:17
1
stne wrote:
vishumangal wrote:
ScottTargetTestPrep wrote:
Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags?
(A) 5
(B) 11
(C) 250
(D) 300
(E) 360

Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation:

25(n + 1) = 30n

25n + 25 = 30n

25 = 5n

5 = n

So, the same number of bags are produced in 5 x 60 = 300 minutes.

Answer: D


Hi,

As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take.

So if we calculate the numbers of factory line A has worked is 360 mins.

Seems like this question is poorely written.

Both 360 and 300 can be the ans depending upon the inference of a test taker

Posted from my mobile device


Hi vishumangal,
You are correct
That was precisely my query, one should be honest about one's reply rather than formulate the explanation to suit the OA.
IMO there is no way we can be sure whether total time from beginning or time taken after B starts , is being asked for here.
if any moderator can correct me , I would be grateful.


Edited the stem to make the question less ambiguous.

Hope now the question is fine.
_________________
Director
Director
User avatar
V
Joined: 27 May 2012
Posts: 838
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 19 Aug 2019, 03:52
Bunuel wrote:
stne wrote:
vishnumangal wrote:
Hi,

As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take.

So if we calculate the numbers of factory line A has worked is 360 mins.

Seems like this question is poorely written.

Both 360 and 300 can be the ans depending upon the inference of a test taker


You are correct
That was precisely my query, one should be honest about one's reply rather than formulate the explanation to suit the OA.
IMO there is no way we can be sure whether total time from beginning or time taken after B starts , is being asked for here.
if any moderator can correct me , I would be grateful.


Edited the stem to make the question less ambiguous.

Hope now the question is fine.


Thank you sir, now everything looks awesome!
_________________
- Stne
GMAT Club Legend
GMAT Club Legend
User avatar
D
Joined: 18 Aug 2017
Posts: 4491
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member CAT Tests
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 19 Aug 2019, 05:10
EncounterGMAT wrote:
Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags?

(A) 5
(B) 11
(C) 250
(D) 300
(E) 360


from given info
we have
25*(x+1)=30x
x= 5 hrs or say 300 mins
IMO D
_________________
If you liked my solution then please give Kudos. Kudos encourage active discussions.
Director
Director
User avatar
P
Joined: 03 Jun 2019
Posts: 954
Location: India
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 19 Aug 2019, 05:15
EncounterGMAT wrote:
Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags?

(A) 5
(B) 11
(C) 250
(D) 300
(E) 360


Let the time after line B started production, will the two factory line have produced the same number of leather bags = x hours
30x = 25x + 25
5x = 25
x = 5 hours = 300 minutes


IMO D
_________________
"Success is not final; failure is not fatal: It is the courage to continue that counts."

Please provide kudos if you like my post. Kudos encourage active discussions.

My GMAT Resources: -

Efficient Learning

Tele: +91-11-40396815
Mobile : +91-9910661622
E-mail : kinshook.chaturvedi@gmail.com
Manager
Manager
User avatar
S
Joined: 18 Dec 2017
Posts: 162
Re: Factory line A assembles materials and makes leather bags at a rate of  [#permalink]

Show Tags

New post 19 Aug 2019, 11:54
EncounterGMAT wrote:
Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags?

(A) 5
(B) 11
(C) 250
(D) 300
(E) 360


B is making 5 more than A. A is already ahead in the game with 25 bags. B will take 5 hours to make those 25 bags. 5 hours is 300 minutes. Hence D
_________________
Please be generous in giving kudos :)
“Practice is the hardest part of learning, and training is the essence of transformation.” ― Ann Voskamp
Software Tester currently in USA ( ;-) )
GMAT Club Bot
Re: Factory line A assembles materials and makes leather bags at a rate of   [#permalink] 19 Aug 2019, 11:54
Display posts from previous: Sort by

Factory line A assembles materials and makes leather bags at a rate of

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





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