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# Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to n

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Senior Manager
Joined: 18 Feb 2019
Posts: 385
Location: India
GMAT 1: 460 Q42 V13
GPA: 3.6
Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to n  [#permalink]

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25 Apr 2019, 09:59
2
00:00

Difficulty:

55% (hard)

Question Stats:

32% (01:12) correct 68% (01:37) wrong based on 19 sessions

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Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to nearest tens). On an average, the number of pages ‘x’ that Amy wrote per day must have been between -

A. 315/25≤x≤325/15
B. 315/15<x<325/25
C. 315/24≤x≤324/15
D. 320/25<x<320/15
E. 315/20<x<325/20
Math Expert
Joined: 02 Aug 2009
Posts: 7687
Re: Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to n  [#permalink]

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25 Apr 2019, 22:59
kiran120680 wrote:
Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to nearest tens). On an average, the number of pages ‘x’ that Amy wrote per day must have been between -

A. 315/25≤x≤325/15
B. 315/15<x<325/25
C. 315/24≤x≤324/15
D. 320/25<x<320/15
E. 315/20<x<325/20

320 pages (rounded to nearest tens) - means 315 to 324
20 days (rounded to nearest tens) - means 15 to 24

Average is pages /days..
Max average will be (max pages)/(least days)=$$\frac{324}{15}$$
Min average will be (min pages)/(max days)=$$\frac{315}{24}$$

The range, therefore, is $$\frac{315}{24}$$≤x≤$$\frac{324}{15}$$

C
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Re: Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to n  [#permalink]

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26 Apr 2019, 00:11
kiran120680 wrote:
Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to nearest tens). On an average, the number of pages ‘x’ that Amy wrote per day must have been between -

A. 315/25≤x≤325/15
B. 315/15<x<325/25
C. 315/24≤x≤324/15
D. 320/25<x<320/15
E. 315/20<x<325/20

For more on rounding rules, check: https://www.veritasprep.com/blog/2014/0 ... or-a-five/
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Karishma
Veritas Prep GMAT Instructor

Re: Amy wrote 320 pages (rounded to nearest tens) in 20 days (rounded to n   [#permalink] 26 Apr 2019, 00:11
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