It is currently 16 Dec 2018, 16:25
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.

GRE Math Challenge #87- Which of the following CANNOT

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4750
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1664 [0], given: 396

CAT Tests
GRE Math Challenge #87- Which of the following CANNOT [#permalink] New post 09 May 2015, 11:35
Expert's post
00:00

Question Stats:

75% (01:41) correct 25% (00:01) wrong based on 4 sessions
Which of the following CANNOT be the sum of two integers that have a product of 30?

(A) 31
(B) 17
(C) –11
(D) –13
(E) –21
[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

Director
Director
Joined: 20 Apr 2016
Posts: 761
Followers: 6

Kudos [?]: 517 [0], given: 94

CAT Tests
Re: GRE Math Challenge #87- Which of the following CANNOT [#permalink] New post 18 Dec 2017, 00:45
sandy wrote:
Which of the following CANNOT be the sum of two integers that have a product of 30?

(A) 31
(B) 17
(C) –11
(D) –13
(E) –21



Here 30 can be written as-

5 * 6

10 * 3

15 * 2

The sum of these integeres are

5 +6 = 11

10 + 3 =13

15 + 2 = 17

But sum of these can also be negative, since negative * negative = postive i. e

-5 + (-6) = -11 and -5 * -6 = 30

-10 + (-3)= -13 and -10 * -3 = 30

-15 + (-2)= -17 and -15 * -2 = 30.

Thus only -21 donot fit into this and hence is the answer
_________________

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

Manager
Manager
Joined: 25 Nov 2017
Posts: 51
Followers: 0

Kudos [?]: 41 [0], given: 5

Re: GRE Math Challenge #87- Which of the following CANNOT [#permalink] New post 18 Dec 2017, 02:33
We can list the factors of 30.
30 * 1 = 30 SUM = 31
15 * 2 = 30 SUM = 17
10 * 3 = 30 SUM = 13
6 * 5 = 30 SUM = 11

Remember that two negative numbers give us a positive number. So we shoukd consider their negatives.
The only answer that does not show up us D.
Re: GRE Math Challenge #87- Which of the following CANNOT   [#permalink] 18 Dec 2017, 02:33
Display posts from previous: Sort by

GRE Math Challenge #87- Which of the following CANNOT

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.