It is currently 15 Nov 2018, 02:11
My Tests

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.

QOTD#17 If x is divisible by 78, which of the following must

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 90

Kudos [?]: 1606 [0], given: 375

CAT Tests
QOTD#17 If x is divisible by 78, which of the following must [#permalink] New post 22 Nov 2016, 16:41
Expert's post
00:00

Question Stats:

0% (00:00) correct 100% (00:24) wrong based on 6 sessions
If x is divisible by 78, which of the following must be divisible by x?
Indicate all possible values.

A. \(\frac{x}{78}\)
B. \(x\)
C. \(x+78\)
D. \(78-x\)
E. \(78x\)
F. \(78x+78\)

Drill 4
Question: 12
Page: 295


[Reveal] Spoiler: OA
B and F
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 90

Kudos [?]: 1606 [0], given: 375

CAT Tests
Re: QOTD#17 If x is divisible by 78, which of the following must [#permalink] New post 22 Nov 2016, 16:44
Expert's post
Explanation

There are variables in the answer choices, so Plug In. Try x = 78. You can eliminate choices (A) and (D). Now try a weird number: 0. Eliminate choice (G). Try one more number: 156, which is double 78. This time you can eliminate choices (C) and (E). A number is divisible by itself and a multiple of a number is divisible by that number, so the correct answers are choices (B) and (F).

Hence options B and F are correct.
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Intern
Intern
Joined: 10 Jul 2016
Posts: 10
Followers: 0

Kudos [?]: 6 [0], given: 5

Re: QOTD#17 If x is divisible by 78, which of the following must [#permalink] New post 13 Dec 2016, 07:04
Why (E) can't be an answer?
Intern
Intern
Joined: 07 Aug 2016
Posts: 16
Followers: 0

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

Re: QOTD#17 If x is divisible by 78, which of the following must [#permalink] New post 15 Jan 2017, 04:32
Hi Sandy, can you give me a detailed working for the above question.. Thanks
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 90

Kudos [?]: 1606 [0], given: 375

CAT Tests
Re: QOTD#17 If x is divisible by 78, which of the following must [#permalink] New post 15 Jan 2017, 15:31
Expert's post
shikha0611 wrote:
Hi Sandy, can you give me a detailed working for the above question.. Thanks



Again plugging is the best strategy for these questions. We plug 78 and 0 as values of x.

Regards,
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

3 KUDOS received
Intern
Intern
Joined: 23 Mar 2017
Posts: 9
Followers: 0

Kudos [?]: 13 [3] , given: 1

Re: QOTD#17 If x is divisible by 78, which of the following must [#permalink] New post 12 Jun 2017, 09:06
3
This post received
KUDOS
sandy wrote:
Explanation

There are variables in the answer choices, so Plug In. Try x = 78. You can eliminate choices (A) and (D). Now try a weird number: 0. Eliminate choice (G). Try one more number: 156, which is double 78. This time you can eliminate choices (C) and (E). A number is divisible by itself and a multiple of a number is divisible by that number, so the correct answers are choices (B) and (F).

Hence options B and F are correct.



Your solution is Incorrect.

Let me explain this ==>

Here question is asking us => "Which of the following is divisible by x"

Option 1) x/78 => Let x=78 => x/78 = 1 and 1 is not divisible by 78 => REJECT.

Option 2) x/x =1 => Accept

Option 3) (x+78)/x => 1+(78/x) => Is x= 78 => OK else if x=78*2 => Not OK => REJECT.

Option 4) (78-x)/x => 78/x - 1 => If x=78 => OK else if x=78*2 => Not OK => REJECT.

Option 5) 78x/x => 78 => ALWAYS an integer.=> ACCEPT
(You cannot plus in x as zero as division by zero is considered to be illegal on the GRE. You can take any value of x => and this will always be 78 which is an integer)


Option 6) (78x +78)/x => 78 + 78/x => If x = 78 => OK else if x=78*2 = Not OK => REJECT.


Hence the Correct answer choices must be B and E

Smash that B and E


Regards
Stone Cold
Re: QOTD#17 If x is divisible by 78, which of the following must   [#permalink] 12 Jun 2017, 09:06
Display posts from previous: Sort by

QOTD#17 If x is divisible by 78, which of the following must

  Question banks Downloads My Bookmarks Reviews Important topics  


GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.