Last visit was: 27 Dec 2024, 07:17 It is currently 27 Dec 2024, 07:17
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

Close

GRE Prep 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 GRE 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
PREVIOUS TOPIC
NEXT TOPIC

GRE Math Challenge #132- x + y + n = 15 x + y + k = 9

Tags :
Find Similar Topics  About  Add a Tag

Show Tags
Hide Tags

User avatar
sandy
Retired Moderator
Joined: 07 Jun 2014
Posts: 4815
Own Kudos [?]: 11277 [0]
Given Kudos: 0
GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
Send PM
GRE Math Challenge #132- x + y + n = 15 x + y + k = 9 [#permalink] New post   Updated on: 20 Feb 2020, 16:10
Expert Reply
00:00

Question Stats:

97% (00:23) correct 2% (00:32) wrong based on 78 sessions

Hide Show timer Statistics

\(x + y + n = 15\)

\(x + y + k = 9\)

Quantity A
Quantity B
\(n-k\)
\(6\)


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.

Kudos for the right answer and explanation
ShowHide Answer
Official Answer
C

Originally posted by sandy on 15 May 2015, 11:35.
Last edited by Carcass on 20 Feb 2020, 16:10, edited 1 time in total.
Updated
User avatar
P
GreenlightTestPrep
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Own Kudos [?]: 12239 [0]
Given Kudos: 136
Send PM

Top Member of the Month
Re: GRE Math Challenge #132 [#permalink] New post   17 May 2015, 08:39
1
sandy wrote:
x + y + n = 15
x + y + k = 9

Quantity A: n – k
Quantity B: 6


We need to recognize that, if we subtract the bottom equation from the top equation, something nice happens. We get:

(x + y + n) - (x + y + k) = 15 - 9
Simplify: n - k = 6

So, we get:
Quantity A: 6
Quantity B: 6

Answer:
Show: ::
C


Cheers,
Brent
avatar
B
Subliminal
Intern
Intern
Joined: 06 Dec 2018
Posts: 5
Own Kudos [?]: 3 [0]
Given Kudos: 4
GRE 1: Q170 V160
Send PM
Re: GRE Math Challenge #132- x + y + n = 15 x + y + k = 9 [#permalink] New post   28 Sep 2020, 08:57
1
When a question asks us to find the value of (n-k), we try to find the value of (n-k) by manipulating the equations. Trying to find n and k separately and then finding n-k is a very common trap that one can get into. If you thought like this, you were probably wondering how you could find out the values of n and k when there are fewer equations than unknowns.

x+y+n = 15
x+y+k = 9.

Subtracting the second equation from the first, we have n-k = 6.

So, there is no need to find out n and k to compute n-k.

Quantity A is equal to Quantity B.
Correct answer is option C.
Prep Club for GRE Bot
gmatclubot
Re: GRE Math Challenge #132- x + y + n = 15 x + y + k = 9 [#permalink]
28 Sep 2020, 08:57
Moderators:
adewale223
GRE Instructor
88 posts
bronaugust
GRE Forum Moderator
37 posts
BrushMyQuant
Moderator
1115 posts
VibhuAnurag
GRE Instructor
234 posts

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

Main navigation

Partners

GRE Resources

www.ets.org/gre | About | Terms and Conditions and Privacy Policy | Prep Club for GRE Rules | Contact