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

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SVP
Status: Preparing GMAT
Joined: 02 Nov 2016
Posts: 2034
Location: Pakistan
GPA: 3.39
Of the pages produced by a printing press, 15% are unusable. How many  [#permalink]

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09 May 2017, 11:56
00:00

Difficulty:

25% (medium)

Question Stats:

83% (01:50) correct 17% (02:18) wrong based on 29 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

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Senior PS Moderator
Joined: 26 Feb 2016
Posts: 3334
Location: India
GPA: 3.12
Re: Of the pages produced by a printing press, 15% are unusable. How many  [#permalink]

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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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Manager
Joined: 05 Nov 2016
Posts: 88
Re: Of the pages produced by a printing press, 15% are unusable. How many  [#permalink]

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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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Senior SC Moderator
Joined: 22 May 2016
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Of the pages produced by a printing press, 15% are unusable. How many  [#permalink]

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09 May 2017, 13:52
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

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