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Working at a constant rate, a copy machine makes 20 copies of a one-pa

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Working at a constant rate, a copy machine makes 20 copies of a one-pa  [#permalink]

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New post 29 Jul 2018, 01:40
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Working at a constant rate, a copy machine makes 20 copies of a one-page document per minute. If the machine works at this constant rate, how many hours does it take to make 4,800 copies of a one-page document?

A. 4
B. 5
C. 6
D. 7
E. 8


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Re: Working at a constant rate, a copy machine makes 20 copies of a one-pa  [#permalink]

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New post 29 Jul 2018, 01:53
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Bunuel wrote:
Working at a constant rate, a copy machine makes 20 copies of a one-page document per minute. If the machine works at this constant rate, how many hours does it take to make 4,800 copies of a one-page document?


20 Copies = 1 Min
1 Copy = 1 / 20 Min

Therefore,
4800 Copies = 4800 / 20 Min
4800 Copies = 240 Min = 240 / 60 Hrs = 4 Hrs

Hence, A.
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Re: Working at a constant rate, a copy machine makes 20 copies of a one-pa  [#permalink]

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New post 03 Aug 2018, 14:06
Bunuel wrote:
Working at a constant rate, a copy machine makes 20 copies of a one-page document per minute. If the machine works at this constant rate, how many hours does it take to make 4,800 copies of a one-page document?

A. 4
B. 5
C. 6
D. 7
E. 8


If the copy machine can make 20 copies of a one-page document per minute, then it can make 20 x 60 = 1,200 copies per hour. So it will take 4,800/1,200 = 4 hours to make 4,800 copies.

Answer: A
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Re: Working at a constant rate, a copy machine makes 20 copies of a one-pa  [#permalink]

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New post 04 Aug 2018, 07:07
Bunuel wrote:
Working at a constant rate, a copy machine makes 20 copies of a one-page document per minute. If the machine works at this constant rate, how many hours does it take to make 4,800 copies of a one-page document?

A. 4
B. 5
C. 6
D. 7
E. 8


NEW question from GMAT® Quantitative Review 2019



(PS03439)


The efficiency of the machine per hour is \(20*60 = 1200\)

So, To produce \(4800\) copies time required is \(\frac{4800}{1200} = 4\) Hours, Answer must be (A)
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Re: Working at a constant rate, a copy machine makes 20 copies of a one-pa  [#permalink]

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New post 07 Aug 2018, 07:56
1
Bunuel wrote:
Working at a constant rate, a copy machine makes 20 copies of a one-page document per minute. If the machine works at this constant rate, how many hours does it take to make 4,800 copies of a one-page document?

A. 4
B. 5
C. 6
D. 7
E. 8


NEW question from GMAT® Quantitative Review 2019



(PS03439)

------------------------------------------------------------------------------------------------------------------------------------------------


20 copies in 60 seconconds

20/60=3 seconds per 1 copy
4,800 copies * 3seconds= 14400 seconds
14400/per 60=240 minutes
240 minutes/60=4 hours
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Working at a constant rate, a copy machine makes 20 copies of a one-pa  [#permalink]

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New post 02 Oct 2018, 05:42
1
Copy machine makes 20 copies=1 min
So, 4800 copies=4800/20= 240 mins

240 mins=240/60 = 4 hrs

(A)
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Working at a constant rate, a copy machine makes 20 copies of a one-pa &nbs [#permalink] 02 Oct 2018, 05:42
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