It is currently 23 Nov 2017, 21:06

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If n is a positive integer, what is the tens digit of n? 1)

Author Message
Manager
Joined: 12 Aug 2008
Posts: 60

Kudos [?]: 4 [0], given: 2

If n is a positive integer, what is the tens digit of n? 1) [#permalink]

### Show Tags

16 Sep 2009, 18:49
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If n is a positive integer, what is the tens digit of n?

1) The hundreds digit of 10n is 6
2) The tens digit of n+1 is 7

If the number n is a two digit number (any number from 60 to 69) then yes the answer is A as the tens digit of n will be 6.

But what if n is 160? Then 10n is 1600. The hundreds digit is 6 but the tens digit is 0.

What am I missing here?

Kudos [?]: 4 [0], given: 2

Manager
Joined: 10 Aug 2009
Posts: 129

Kudos [?]: 76 [0], given: 10

Re: DS -- OG 12 #167 [#permalink]

### Show Tags

16 Sep 2009, 19:05
10n can not be 1600 (the hundreds digit here is 0 instead of required 6) and n can not be 160 (for the same reason)...

it is given that the hundreds digit of 10n is 6, therefore the tens digit of n is 6...

Kudos [?]: 76 [0], given: 10

Manager
Joined: 12 Aug 2008
Posts: 60

Kudos [?]: 4 [0], given: 2

Re: DS -- OG 12 #167 [#permalink]

### Show Tags

16 Sep 2009, 19:16
LenaA wrote:
10n can not be 1600 (the hundreds digit here is 0 instead of required 6) and n can not be 160 (for the same reason)...

it is given that the hundreds digit of 10n is 6, therefore the tens digit of n is 6...

Sorry, I don't understand. The hundreds digit of 1600 (10 times 160) is six -- the thousands digit is 1, the tens digit is 0 and the ones digit is zero. Only after the decimal we have tens, hundrerd, thousands, etc; before the decimal we have ones, tens, hundreds, thousands, etc.

10n means 10 times n. Where does the question say that n is a two digit number?

Really confused

Kudos [?]: 4 [0], given: 2

Manager
Joined: 10 Aug 2009
Posts: 129

Kudos [?]: 76 [0], given: 10

Re: DS -- OG 12 #167 [#permalink]

### Show Tags

16 Sep 2009, 19:37
sorry
ignore the first part of my post...i got confused

n can be 160 (the tens digit is 6) and 10n can be 1600 (hundreds digit is 6).

if the hundreds digit is 6 in 10n than the tens digit in n is 6 as well

Kudos [?]: 76 [0], given: 10

Director
Joined: 01 Apr 2008
Posts: 872

Kudos [?]: 861 [0], given: 18

Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Re: DS -- OG 12 #167 [#permalink]

### Show Tags

16 Sep 2009, 20:12
Good question...
1) n can be 60,61....69 OR 160,161,...169. For each case tens digit is always 6. suff
2) n can be 69,70...78. not suff

Kudos [?]: 861 [0], given: 18

Manager
Joined: 15 Sep 2009
Posts: 131

Kudos [?]: 27 [0], given: 2

Re: DS -- OG 12 #167 [#permalink]

### Show Tags

16 Sep 2009, 23:19
1) The hundreds digit of 10n is 6.Suff.(N = 60-69)
2) The tens digit of n+1 is 7.Nt suff

I wud go with option A

Kudos [?]: 27 [0], given: 2

Current Student
Affiliations: ?
Joined: 20 Jul 2009
Posts: 191

Kudos [?]: 40 [0], given: 6

Location: Africa/Europe
Schools: Kellogg; Ross (\$\$); Tuck
Re: DS -- OG 12 #167 [#permalink]

### Show Tags

17 Sep 2009, 01:30
Yes I go for A too.

Let's say n= abcd (a four didit number here, but it can be what ever we want).

1) 10n = abcd0 and we are told that the hindreds digit of this number is 6; meaning that c is 6. but c is aloso the tens digit of the original number. so 1) is suff.

2) tens difgits of n+1 is 7. not suff.

Kudos [?]: 40 [0], given: 6

Manager
Joined: 12 Aug 2008
Posts: 60

Kudos [?]: 4 [0], given: 2

Re: DS -- OG 12 #167 [#permalink]

### Show Tags

17 Sep 2009, 01:56
Thanks all.

I now know where I was, unnecessarily, getting confused.

Kudos [?]: 4 [0], given: 2

Re: DS -- OG 12 #167   [#permalink] 17 Sep 2009, 01:56
Display posts from previous: Sort by