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Of the pages produced by a printing press, 15% are unusable. How many

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VP
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Of the pages produced by a printing press, 15% are unusable. How many [#permalink]

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New post 09 May 2017, 11:56
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

79% (01:27) correct 21% (02:10) wrong based on 24 sessions

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Of the pages produced by a printing press, 15% are unusable. How many pages must be produced per minute by the printing press to yield 1,020 usable pages in an hour?

A. 17
B. 20
C. 23
D. 24
E. 25.5
[Reveal] Spoiler: OA

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Re: Of the pages produced by a printing press, 15% are unusable. How many [#permalink]

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New post 09 May 2017, 12:01
In an hour, 1020 pages are produced. Hence, we will have 17 pages in a minute.

The pages produced are 20(100%) and 3(15%) of the pages are unusable.(Option B)
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Re: Of the pages produced by a printing press, 15% are unusable. How many [#permalink]

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New post 09 May 2017, 12:55
Lets consider 100 pages per minute
thus 85 are usable and 15 are unusable
1020/60 = 17 pages per minute
85-15
17-x
x=3
unusable pages = 3
total pages = 17+3 = 20
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Of the pages produced by a printing press, 15% are unusable. How many [#permalink]

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New post 09 May 2017, 13:52
SajjadAhmad wrote:
Of the pages produced by a printing press, 15% are unusable. How many pages must be produced per minute by the printing press to yield 1,020 usable pages in an hour?

A. 17
B. 20
C. 23
D. 24
E. 25.5


If we need 1,020 pages in an hour:

1. 15% of the TOTAL number of pages produced that hour will be defective, so 1,020 = 85% of that total (x)

2. 1,020 = .85x ==>

x = 1200 pages needed total in one hour

3. Convert to per minute:

1200 / 60 (mins in an hour) =

20 pages per minute

Answer B
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Of the pages produced by a printing press, 15% are unusable. How many   [#permalink] 09 May 2017, 13:52
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