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# How many digits are required to number a book containing...

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Senior Manager
Joined: 03 Sep 2012
Posts: 346

Kudos [?]: 223 [1], given: 35

Location: United States
Concentration: Healthcare, Strategy
GMAT 1: 730 Q48 V42
GPA: 3.88
WE: Medicine and Health (Health Care)
How many digits are required to number a book containing... [#permalink]

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01 Oct 2012, 07:08
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Difficulty:

25% (medium)

Question Stats:

74% (01:14) correct 26% (01:27) wrong based on 121 sessions

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How many digits are required to number a book containing 200 pages ?

A) 200
B) 600
C) 492
D) 372
E) 250
[Reveal] Spoiler: OA

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"When you want to succeed as bad as you want to breathe, then you’ll be successful.” - Eric Thomas

Kudos [?]: 223 [1], given: 35

Math Expert
Joined: 02 Sep 2009
Posts: 41871

Kudos [?]: 128514 [2], given: 12179

Re: How many digits are required to number a book containing... [#permalink]

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06 Nov 2012, 08:06
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Expert's post
KevinBrink wrote:
The first part containing the unit digits is easy to understand, however the parts containing the tens digits and hundreds digits needs some extra clarification.

Each page from 1 to 9, inclusive (so total of 9 pages) needs one digit;
Each page from 10 to 99, inclusive (so total of 90 pages) needs two digits (for example page 12 needs two digits: 1 and 2);
Each page from 100 to 200, inclusive (so total of 101 pages) needs three digits (for example page 123 needs three digits: 1, 2 and 3).

Hope it's clear.
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Kudos [?]: 128514 [2], given: 12179

Senior Manager
Joined: 03 Sep 2012
Posts: 346

Kudos [?]: 223 [1], given: 35

Location: United States
Concentration: Healthcare, Strategy
GMAT 1: 730 Q48 V42
GPA: 3.88
WE: Medicine and Health (Health Care)
Re: How many digits are required to number a book containing... [#permalink]

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06 Nov 2012, 08:18
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Quote:
Thanks, the content question is not hard however it did not understand it because of the odd strange pronunciation! Thanks for the clarification!

After attempting hundreds of official GMAT questions (OG11.12 and 13) i can safely say that the language used by the GMAT will be less ambiguous and clearer..
_________________

"When you want to succeed as bad as you want to breathe, then you’ll be successful.” - Eric Thomas

Kudos [?]: 223 [1], given: 35

Math Expert
Joined: 02 Sep 2009
Posts: 41871

Kudos [?]: 128514 [0], given: 12179

Re: How many digits are required to number a book containing... [#permalink]

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01 Oct 2012, 07:16
Expert's post
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BOOKMARKED
vomhorizon wrote:
How many digits are required to number a book containing 200 pages ?

A) 200
B) 600
C) 492
D) 372
E) 250

9 pages from 1 to 9 will require 9 digits;
90 pages from 10 to 99 will require 90*2=180 digits;
200-(90+9)=101 pages will require 101*3=303 digits.

Total: 9+180+303=492.

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Re: How many digits are required to number a book containing... [#permalink]

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06 Nov 2012, 07:49
Bunuel can you give a more detailed explanation, because I think the question is a little ambiguitios

Kudos [?]: 4 [0], given: 11

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Kudos [?]: 128514 [0], given: 12179

Re: How many digits are required to number a book containing... [#permalink]

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06 Nov 2012, 07:54
KevinBrink wrote:
Bunuel can you give a more detailed explanation, because I think the question is a little ambiguitios

Can you please tell me which part of the question is ambiguous or which part of the solution needs clarification? Thank you.
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Re: How many digits are required to number a book containing... [#permalink]

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06 Nov 2012, 07:59
The first part containing the unit digits is easy to understand, however the parts containing the tens digits and hundreds digits needs some extra clarification.

Kudos [?]: 4 [0], given: 11

Intern
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Posts: 35

Kudos [?]: 4 [0], given: 11

Re: How many digits are required to number a book containing... [#permalink]

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06 Nov 2012, 08:09
Thanks, the content question is not hard however it did not understand it because of the odd strange pronunciation! Thanks for the clarification!

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Re: How many digits are required to number a book containing... [#permalink]

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14 Jan 2015, 04:51
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Re: How many digits are required to number a book containing... [#permalink]

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05 Apr 2016, 21:57
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: How many digits are required to number a book containing...   [#permalink] 05 Apr 2016, 21:57
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