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# A machine puts c caps on bottles in m minutes. How many hours will it

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Manager
Joined: 12 Mar 2012
Posts: 80
Location: India
Concentration: Technology, Strategy
GMAT 1: 710 Q49 V36
GPA: 3.2
WE: Information Technology (Computer Software)
A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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20 Mar 2013, 17:44
4
00:00

Difficulty:

55% (hard)

Question Stats:

59% (00:58) correct 41% (01:15) wrong based on 354 sessions

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A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles?

A. 60bm/c
B. bm/(60c)
C. bc/(60m)
D. 60b/(cm)
E. b/(60cm)
Math Expert
Joined: 02 Sep 2009
Posts: 52348
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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16 May 2016, 01:45
10
A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles?

A. 60bm/c
B. bm/(60c)
C. bc/(60m)
D. 60b/(cm)
E. b/(60cm)

A machine puts c caps on bottles in m minutes --> the rate of the machine is (rate) = (job)/(time) = c/m cap/minute.

The time needed to put caps on b bottles (time) = (job)/(rate) = b/(c/m) minutes = bm/c minutes = bm/(60c) hours.

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##### General Discussion
Manager
Joined: 25 Apr 2014
Posts: 112
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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25 Jun 2014, 20:24
Either we can fix it with the help of a small formula which is :
(M1 * D1 * H1)/ W1 = (M2 * D2 * H2)/ W2
where M , D and H stands for Men, Days and Hours invested for each of the 2 Works respectively.

So here it goes:
M1= 1 (as we are not given the value)
D1 = m/60 (in hrs)
H1 = 1 (as we are not given the value) and
W1 = c

and

M2 = 1 (as we are not given the value)
D2 = x (in hrs) (to be found out)
H2 = 1 (as we are not given the value) and
W2 = b (as given)

So, (1 *m/60 *1)/c = (1* x* 1)/b
=> (m/60)/c = x/b
Therefore,
=> x= bm/60c.

P.S. Please let me know if anything went wrong as this is my first post as a solution.
Manager
Joined: 12 Jun 2015
Posts: 79
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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16 May 2016, 02:05
3
A machine puts c caps on bottles in m minutes.
So, the machine puts 1 cap in m/c minutes

To put caps on b bottles, the machine will take bm/c minutes
In order to calculate the no. of hours taken , divide the product by 60.

Intern
Joined: 06 May 2016
Posts: 16
WE: Education (Education)
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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16 May 2016, 04:27
1
The key for me is to realise that 1 bottle can only have 1 cap.
(ie bottles can be multiplied with minutes/cap and cancel out leaving only time)

Without that it seems super difficult but actually is a very straightforward calculation.
SVP
Joined: 26 Mar 2013
Posts: 2001
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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17 May 2016, 04:23
We can plug in simple numbers

2 caps per 1 min,, then rate= 2 caper/min

Put b= 120 or 60 bottles.. I used 120 bottles

120= 2 * t.....>t=60 min =1 hr

Scanning the answer choice.. Eliminate A & D as you need to divide minute by 60.
Eliminate E as CM should be together.

Substitute number in choice B & C

In bm/60c= (120*1)/ (2 *60) = 1

Manager
Joined: 01 Nov 2016
Posts: 66
Concentration: Technology, Operations
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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24 Apr 2017, 14:07
Bunuel wrote:
A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles?

A. 60bm/c
B. bm/60c
C. bc/60m
D. 60b/cm
E. b/60cm

A machine puts c caps on bottles in M minutes. A bottle can only have 1 cap, so this means that in M minutes, the machine will cap C bottles

$$\frac{M minutes}{C bottles}$$

How many hours will it take to put caps on B bottles? This is a comparison ratio:

$$\frac{M minute}{C bottles}$$ * $$\frac{1 hour}{60 minutes}$$ = $$\frac{X hours}{B bottles}$$

This becomes:

$$\frac{(M minute)(B bottles)(1 hour)}{(C bottles)(60 minutes)}$$ = $$x hours$$

Simplify to:

$$\frac{mb}{60c}$$ = $$x hours$$

This question's only difficulty is seeing that they want you to do a comparison between c bottles and b bottles. They intentionally made the letters confusing for those that could only see b should stand for bottles.
VP
Joined: 07 Dec 2014
Posts: 1152
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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12 Jun 2017, 18:46
chiccufrazer1 wrote:
A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles?

A. 60bm/c
B. bm/60c
C. bc/60m
D. 60b/cm
E. b/60cm

bottling rate=c/m
minutes to cap b bottles=b/(c/m)=bm/c
hours to cap b bottles=(bm/c)/60=bm/60c
B
Manager
Joined: 02 Jan 2016
Posts: 124
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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03 Aug 2018, 20:35
Rate Time = Work
C/M M C

C/M x = B

So, (RT = W); X*C/M = B; BM/C this is in Hours, therefore BM/C/60= BM/C60
Manager
Joined: 06 Nov 2016
Posts: 62
Location: Viet Nam
GPA: 3.54
Re: A machine puts c caps on bottles in m minutes. How many hours will it  [#permalink]

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03 Aug 2018, 20:59
Bunuel wrote:
A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles?

A. 60bm/c
B. bm/(60c)
C. bc/(60m)
D. 60b/(cm)
E. b/(60cm)

my approach:

we have : c caps --> m minutes
therefore b caps --> $$\frac{(b*m)}{c}$$ minutes

And : 60 minutes = 1 hour
so: $$\frac{(b*m)}{c}$$ minutes = $$\frac{(b*m)}{(c*60)}$$ hours

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Re: A machine puts c caps on bottles in m minutes. How many hours will it &nbs [#permalink] 03 Aug 2018, 20:59
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