GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 23 Oct 2019, 19:00

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.

Close

Request Expert Reply

Confirm Cancel

If the units’ digit of a three-digit positive number N is between 1 to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58464
If the units’ digit of a three-digit positive number N is between 1 to  [#permalink]

Show Tags

New post 27 Sep 2018, 05:52
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

67% (01:39) correct 33% (01:43) wrong based on 94 sessions

HideShow timer Statistics

SC Moderator
User avatar
P
Status: GMAT - Pulling Quant and Verbal together
Joined: 04 Sep 2017
Posts: 237
Location: United States (OH)
Concentration: Technology, Leadership
GPA: 3.6
WE: Sales (Computer Software)
Re: If the units’ digit of a three-digit positive number N is between 1 to  [#permalink]

Show Tags

New post 27 Sep 2018, 06:43
1
Bunuel wrote:
If the units’ digit of a three-digit positive number N is between 1 to 9, inclusive, what is the tens’ digit of the number?

(1) The tens’ digit of (N + 9) is 4
(2) The tens’ digit of (N + 4) is 3


(1) The tens’ digit of (N + 9) is 4. So N+9 makes a tens digit of 4. Let's say the hundreds digit is 1 (It doesn't matter).

N could be 131 through 139. Therefore we know that the tens digit is 3. Note that it can not be 140 because although 140+9=149, the question states that the unit's digit can not be 0.

Sufficient


(2) The tens’ digit of (N + 4) is 3. So N+4 makes a tense digit of 4.

N could be 127 through 135. So the tens digit could be 2 or 3.

Not Sufficient

Answer: A
_________________
Would I rather be feared or loved? Easy. Both. I want people to be afraid of how much they love me.

How to sort questions by Topic, Difficulty, and Source:
https://gmatclub.com/forum/search.php?view=search_tags
Director
Director
avatar
G
Joined: 19 Oct 2013
Posts: 513
Location: Kuwait
GPA: 3.2
WE: Engineering (Real Estate)
GMAT ToolKit User
Re: If the units’ digit of a three-digit positive number N is between 1 to  [#permalink]

Show Tags

New post 27 Sep 2018, 10:21
We know from statement 1)

N+ 9 has a tens digit of 4

Since we know the units digit can be anything from 1 to 9, 131 + 9 = 140 which satisfies the statement and would put the N value in the range [131,139]

A is sufficient

Try statement 2)

It says N + 4 will yield a tens of 3
127 + 4 = 131
Also 131 + 4 = 135 tens of 3

So the n tens can be 2 or 3

B is insufficient.

Answer choice A

Posted from my mobile device
GMAT Club Bot
Re: If the units’ digit of a three-digit positive number N is between 1 to   [#permalink] 27 Sep 2018, 10:21
Display posts from previous: Sort by

If the units’ digit of a three-digit positive number N is between 1 to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne