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

 It is currently 25 Mar 2019, 23:17

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

If m is 2-digit integer and 2m is 3-digit integer, what is the units'

Author Message
TAGS:

Hide Tags

General GMAT Forum Moderator
Joined: 29 Jan 2015
Posts: 1177
Location: India
WE: General Management (Non-Profit and Government)
If m is 2-digit integer and 2m is 3-digit integer, what is the units'  [#permalink]

Show Tags

23 Feb 2019, 06:01
2
00:00

Difficulty:

55% (hard)

Question Stats:

65% (02:19) correct 35% (01:41) wrong based on 31 sessions

HideShow timer Statistics

If m is 2-digit integer and 2m is 3-digit integer, what is the units' digit of m?

(1) The units' digit of 2m is 4.

(2) The units' digit of m is the same as the units' digit of 2m.

_________________
If you liked my post, kindly give me a Kudos. Thanks.
Intern
Joined: 20 Feb 2019
Posts: 5
Re: If m is 2-digit integer and 2m is 3-digit integer, what is the units'  [#permalink]

Show Tags

23 Feb 2019, 06:38
From statement 1

if unit digit is 4 then

possible values are 54, 64,74 ...

so unit digit in 2m = 4*2 = 8 always

sufficient

statement 2.

unit digit of m and 2m are same which is possible in cases where unit digit is 0

sufficient

Please me know if this is not correct

Posted from my mobile device
Intern
Joined: 05 Mar 2019
Posts: 14
Re: If m is 2-digit integer and 2m is 3-digit integer, what is the units'  [#permalink]

Show Tags

18 Mar 2019, 01:38
It is not correct because the statement 1 says that the unit digit of 2m is 4 not the unit digit of m is 4.

However I am stilled confused because in the way a is written I think it contradicts statement 2?
Re: If m is 2-digit integer and 2m is 3-digit integer, what is the units'   [#permalink] 18 Mar 2019, 01:38
Display posts from previous: Sort by