It is currently 20 Oct 2017, 23:58

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If the sum of x and 20 is 8 more than the difference of 10 and y, what

Author Message
TAGS:

### Hide Tags

VP
Status: Preparing for the GMAT
Joined: 02 Nov 2016
Posts: 1236

Kudos [?]: 1045 [0], given: 538

Location: Pakistan
GPA: 3.4
If the sum of x and 20 is 8 more than the difference of 10 and y, what [#permalink]

### Show Tags

14 Aug 2017, 04:42
00:00

Difficulty:

15% (low)

Question Stats:

74% (00:37) correct 26% (00:46) wrong based on 46 sessions

### HideShow timer Statistics

If the sum of x and 20 is 8 more than the difference of 10 and y, what is the value of x + y?

(A) –2
(B) 8
(C) 9
(D) 28
(E) not enough information
[Reveal] Spoiler: OA

_________________

Official PS Practice Questions
Press +1 Kudos if this post is helpful

Kudos [?]: 1045 [0], given: 538

Director
Joined: 04 Dec 2015
Posts: 696

Kudos [?]: 303 [0], given: 261

Location: India
Concentration: Technology, Strategy
Schools: ISB '19, IIMA , IIMB, XLRI
WE: Information Technology (Consulting)
Re: If the sum of x and 20 is 8 more than the difference of 10 and y, what [#permalink]

### Show Tags

14 Aug 2017, 05:17
If the sum of x and 20 is 8 more than the difference of 10 and y, what is the value of x + y?

(A) –2
(B) 8
(C) 9
(D) 28
(E) not enough information

$$x + 20 = (10-y) + 8$$

$$x + 20 -8 = 10 - y$$

$$x + 12 = 10 -y$$

$$x + y = 10-12$$

$$x + y = -2$$

_________________
Please Press "+1 Kudos" to appreciate.

Kudos [?]: 303 [0], given: 261

BSchool Forum Moderator
Joined: 26 Feb 2016
Posts: 1465

Kudos [?]: 596 [0], given: 16

Location: India
WE: Sales (Retail)
Re: If the sum of x and 20 is 8 more than the difference of 10 and y, what [#permalink]

### Show Tags

14 Aug 2017, 09:41
Translating the word problem into equation,
we have x + 20 = (10 - y) + 8
x + 20 = 18 - y
x + y = 18 - 20
Therefore the value of x + y is -2(Option A)
_________________

Stay hungry, Stay foolish

Kudos [?]: 596 [0], given: 16

Intern
Joined: 26 Jul 2014
Posts: 12

Kudos [?]: 1 [0], given: 11

Re: If the sum of x and 20 is 8 more than the difference of 10 and y, what [#permalink]

### Show Tags

18 Aug 2017, 06:21
Hi,

How can we know that "the difference of 10 and y" is (10 - y) but not (y - 10)?
I chose E and it turns out to be wrong.

Kudos [?]: 1 [0], given: 11

Math Forum Moderator
Joined: 02 Aug 2009
Posts: 4985

Kudos [?]: 5496 [1], given: 112

Re: If the sum of x and 20 is 8 more than the difference of 10 and y, what [#permalink]

### Show Tags

18 Aug 2017, 06:37
1
KUDOS
Expert's post
If the sum of x and 20 is 8 more than the difference of 10 and y, what is the value of x + y?

(A) –2
(B) 8
(C) 9
(D) 28
(E) not enough information

Hi..
There can be two equations..
X+20=10-y+8......X+y=-2..
But second equation is x+20=y-10+8.....X-y=-22..

So we are not sure if 10 is GREATER than y or vice versa..
So ans is E..

OA given is wrong
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Kudos [?]: 5496 [1], given: 112

Target Test Prep Representative
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 1545

Kudos [?]: 837 [0], given: 5

Re: If the sum of x and 20 is 8 more than the difference of 10 and y, what [#permalink]

### Show Tags

18 Aug 2017, 09:04
If the sum of x and 20 is 8 more than the difference of 10 and y, what is the value of x + y?

(A) –2
(B) 8
(C) 9
(D) 28
(E) not enough information

We can create the following equation:

x + 20 = 8 + 10 - y

x + y = - 2

_________________

Jeffery Miller

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Kudos [?]: 837 [0], given: 5

Re: If the sum of x and 20 is 8 more than the difference of 10 and y, what   [#permalink] 18 Aug 2017, 09:04
Display posts from previous: Sort by