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

It is currently 14 Oct 2019, 13:33

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

Four machines, working independently at the same constant rate, can fi

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58320
Four machines, working independently at the same constant rate, can fi  [#permalink]

Show Tags

New post 18 Jan 2019, 01:14
1
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

87% (01:35) correct 13% (01:07) wrong based on 34 sessions

HideShow timer Statistics

Manager
Manager
User avatar
B
Joined: 14 Mar 2018
Posts: 56
GPA: 2.99
Re: Four machines, working independently at the same constant rate, can fi  [#permalink]

Show Tags

New post 18 Jan 2019, 02:04
Thanks Bunuel for the question :)

We have :

Work = a production lot = 1

Time to complete the job: 3 hours = 3 x 60= 180 mins.

=> 4 machines work at a same rate: 1/180

Let x the number of machine that we need to complete the job in 30 mins.

=> 4 machines - 1/180

=> x machines - 1/30

=> x = (4x180)/(30x1)= 720/30= 24 machines.

Answer B.
VP
VP
User avatar
D
Joined: 31 Oct 2013
Posts: 1473
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
CAT Tests
Re: Four machines, working independently at the same constant rate, can fi  [#permalink]

Show Tags

New post 18 Jan 2019, 03:54
Bunuel wrote:
Four machines, working independently at the same constant rate, can fill a production lot in 3 hours. How many of these machines would be needed to fill the lot in 30 minutes?

A 12
B 24
C 36
D 40
E 48



4 machines takes 3 hrs.

Then 12 machines will be needed to fill a production in 1 hr.

Now we want to fill the production in 30 mins.

So, we need 12*2 = 24 machines .

B is the answer.
GMAT Club Legend
GMAT Club Legend
User avatar
D
Joined: 18 Aug 2017
Posts: 4987
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member
Re: Four machines, working independently at the same constant rate, can fi  [#permalink]

Show Tags

New post 18 Jan 2019, 09:50
Bunuel wrote:
Four machines, working independently at the same constant rate, can fill a production lot in 3 hours. How many of these machines would be needed to fill the lot in 30 minutes?

A 12
B 24
C 36
D 40
E 48


1 machine takes 4 * 3 * 60 = 720 mins
so machines required to get work in 30 mins
720/30 = 24 IMO B
_________________
If you liked my solution then please give Kudos. Kudos encourage active discussions.
GMAT Club Bot
Re: Four machines, working independently at the same constant rate, can fi   [#permalink] 18 Jan 2019, 09:50
Display posts from previous: Sort by

Four machines, working independently at the same constant rate, can fi

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





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