NEW HERE? LEARN MORE
closeclose
Last visit was: 27 Apr 2024, 12:20 It is currently 27 Apr 2024, 12:20
Decision Tracker
My Rewards
New posts
New comers' posts

Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

What is the tens place digit of a two-digit positive integer N?

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
P
amanvermagmat
Retired Moderator
Joined: 22 Aug 2013
Posts: 1186
Own Kudos [?]: 2500 [0]
Given Kudos: 459
Location: India
Send PM
What is the tens place digit of a two-digit positive integer N? [#permalink] New post   01 May 2018, 11:22
00:00
A
B
C
D
E

Difficulty:

25% (medium)

Question Stats:

76% (01:15) correct 24% (01:21) wrong based on 58 sessions
Hide Show timer Statistics
What is the tens place digit of a two-digit positive integer N?

(1) 81 < N^2 < 1600

(2) 58 < 2*N < 80
ShowHide Answer
Official Answer
B
avatar
B
nitjet
Intern
Intern
Joined: 22 Dec 2015
Posts: 8
Own Kudos [?]: 10 [0]
Given Kudos: 6
Send PM
Reviews Badge
Re: What is the tens place digit of a two-digit positive integer N? [#permalink] New post   01 May 2018, 12:02
From statement 1:
We know that 81<N2<1600. Therefore, 9<N<40; Possible values are 10, 11,12.....20,21,22,.....31,32....
Therefore statement 1 is not sufficient

Statement 2:
58<2*N<80. Therefore 29<N<40. Hence our possible values are 30,31,32,33,....39.
Therefore statement 2 is sufficent.
avatar
vipinsingh0709
Intern
Intern
Joined: 21 Jan 2018
Posts: 1
Own Kudos [?]: 0 [0]
Given Kudos: 0
Send PM
Re: What is the tens place digit of a two-digit positive integer N? [#permalink] New post   01 May 2018, 22:42
But we are not getting definitive answer with statement 2 as well


Sent from my iPhone using GMAT Club Forum
avatar
manishbatra92
Intern
Intern
Joined: 12 Jun 2016
Posts: 8
Own Kudos [?]: 2 [0]
Given Kudos: 0
Send PM
Re: What is the tens place digit of a two-digit positive integer N? [#permalink] New post   01 May 2018, 23:20
B
Because it is asked for tens digit and hence the equation would be 29<N<40. Hence you would only have 3 in the tens place

Sent from my Moto G (5S) Plus using GMAT Club Forum mobile app
User avatar
L
EgmatQuantExpert
e-GMAT Representative
Joined: 04 Jan 2015
Posts: 3724
Own Kudos [?]: 16861 [0]
Given Kudos: 165
Send PM
Re: What is the tens place digit of a two-digit positive integer N? [#permalink] New post   02 May 2018, 00:02
Expert Reply

Solution



Given:
• N is a two-digit positive integer

To find:
• The tens place digit of N

Analysing Statement 1
• As per the information given in Statement 1, 81 < \(N^2\) < 1600
    o As N is positive integer, we can write 9 < N < 40
    Or, 10 ≤ N ≤ 39
• So, the tens place digit of N can be either of 1, 2, and 3 – we are not getting a unique answer
• Hence, Statement 1 is not sufficient to answer

Analysing Statement 2
• As per the information given in Statement 2, 58 < 2*N < 80
    o Or, 29 < N < 40
    o Or, 30 ≤ N ≤ 39
• As N lies between 30 and 39 (both included), the tens place digit of N is 3
• Hence, Statement 2 is sufficient to answer

Hence, the correct answer is Option B.

Answer: B
User avatar
L
EgmatQuantExpert
e-GMAT Representative
Joined: 04 Jan 2015
Posts: 3724
Own Kudos [?]: 16861 [0]
Given Kudos: 165
Send PM
Re: What is the tens place digit of a two-digit positive integer N? [#permalink] New post   02 May 2018, 00:10
Expert Reply
vipinsingh0709 wrote:
But we are not getting definitive answer with statement 2 as well


Sent from my iPhone using GMAT Club Forum


Most probably you missed that the question is asking for the tens place digit, not the unit digit.
As per statement 2, we can say N can have one of the values between 30, 31, 32, 33, 34, 35, 36, 37, 38, and 39.
Whatever the value of N, the tens place digit is always 3 - therefore, we are getting a unique answer.
GMAT Club Bot
gmatclubot
Re: What is the tens place digit of a two-digit positive integer N? [#permalink]
02 May 2018, 00:10
Moderator:
Bunuel
Math Expert
92955 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions