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

 It is currently 21 Oct 2018, 03:32

### 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

# Operating at the same constant rate, 4 identical machines can produce

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

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 50007
Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

17 Oct 2017, 23:33
1
00:00

Difficulty:

5% (low)

Question Stats:

91% (01:08) correct 9% (01:52) wrong based on 139 sessions

### HideShow timer Statistics

Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

_________________
Intern
Joined: 03 Sep 2017
Posts: 2
Re: Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

18 Oct 2017, 02:22
1machine =55 candle/min
10 machine= 55*10candles=550 candles/min
10 machines in 5 minutes= 550*5=2750 candles

Sent from my Infinix-X600 using GMAT Club Forum mobile app
Senior SC Moderator
Joined: 22 May 2016
Posts: 2038
Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

18 Oct 2017, 11:40
Bunuel wrote:
Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

(# of machines) * r * t = W

4 * r * 1 = 220

r of each machine: $$\frac{220}{(4*1)} = \frac{55}{1}$$

How many candles could 10 such machines produced in 5 minutes?

(# of machines) * r * t = W

10 * $$\frac{55}{1}$$ * 5 = 2750 candles

Answer C
_________________

___________________________________________________________________
For what are we born if not to aid one another?
-- Ernest Hemingway

Senior PS Moderator
Joined: 26 Feb 2016
Posts: 3188
Location: India
GPA: 3.12
Re: Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

19 Oct 2017, 00:03
1
Bunuel wrote:
Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

If 4 identical machine produce a total of 220 candles per minute,
they would produce 1100 candles in 5 minutes.

Since we have been asked to find how many candles 10 such machines make,
we could get that by multiplying the candles by a factor of 2.5(because 4*2.5 = 10)

Therefore, 10 such machines produce 1100*2.5 = 2750 candles(Option C)
_________________

You've got what it takes, but it will take everything you've got

DS Forum Moderator
Joined: 22 Aug 2013
Posts: 1348
Location: India
Re: Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

19 Oct 2017, 01:43
1
4 machines in 1 minute = 220
so 1 machine in 1 minute = 220/4 = 55
so 10 machines in 1 minute = 55*10 = 550
so 10 machines in 5 minutes = 550*5 = 2750

Hence C answer
Manager
Joined: 09 Aug 2017
Posts: 62
Location: United States
Concentration: Technology
GMAT 1: 640 Q44 V33
GMAT 2: 630 Q47 V29
WE: Research (Investment Banking)
Re: Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

23 Oct 2017, 17:50
I got C, first I figured out how many candles a machine makes per minute. 220/4 = 55.
-Next I plug that into the equation 55 per minute * 5 minutes * 10 machines = 2,750.
_________________

I'd love to hear any feedback or ways to improve my problem solving. I make a lot of silly mistakes. If you've had luck improving on stupid mistakes, I'd love to hear how you did it.

Also, I appreciate any kudos.

Target Test Prep Representative
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 3896
Location: United States (CA)
Re: Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

24 Oct 2017, 06:06
Bunuel wrote:
Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

We can determine the rate of 10 machines with the following proportion:

4/220 = 10/x

4x = 2200

x = 550

We know that 10 machines can produce 550 candles in one minute. Thus, in 5 minutes, 10 machines can produce 550 x 5 = 2750 candles.

Answer: C
_________________

Scott Woodbury-Stewart
Founder and CEO

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

CEO
Joined: 12 Sep 2015
Posts: 3021
Location: Canada
Re: Operating at the same constant rate, 4 identical machines can produce  [#permalink]

### Show Tags

25 Apr 2018, 18:03
Top Contributor
Bunuel wrote:
Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

Given: 4 machines produce 220 candles per ONE minute
So, 1 machine produces 55 candles per ONE minute
Therefore, 10 machines produce 550 candles per ONE minute
And 10 machines produce 2750 candles per FIVE minute

Answer: C

Cheers.
Brent
_________________

Brent Hanneson – GMATPrepNow.com

Sign up for our free Question of the Day emails

Re: Operating at the same constant rate, 4 identical machines can produce &nbs [#permalink] 25 Apr 2018, 18:03
Display posts from previous: Sort by

# Operating at the same constant rate, 4 identical machines can produce

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

 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®.