It is currently 11 Dec 2018, 20:07

### 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

# GRE Math Challenge #71- (a/b) or (a+3)/(b+3)

Author Message
TAGS:
GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1654 [0], given: 396

GRE Math Challenge #71- (a/b) or (a+3)/(b+3) [#permalink]  03 May 2015, 01:03
Expert's post
00:00

Question Stats:

71% (00:42) correct 28% (00:27) wrong based on 63 sessions
a and b are positive integers.

 Quantity A Quantity B $$\frac{a}{b}$$ $$\frac{(a+3)}{(b+3)}$$

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

Kudos to the right solution and explanation
[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

GRE Instructor
Joined: 10 Apr 2015
Posts: 1232
Followers: 45

Kudos [?]: 1113 [1] , given: 7

Re: GRE Math Challenge #71 [#permalink]  03 May 2015, 06:29
1
KUDOS
Expert's post
sandy wrote:
a and b are positive integers.

Quantity A: $$a/b$$

Quantity B: $$\frac{(a+3)}{(b+3)}$$

One of my favorite QC strategies is called "Looking for Equality" (free video on this topic here: http://www.greenlighttestprep.com/modul ... on?id=1099).
In this strategy, I first look for values of x such that the two quantities are equal. This often involves checking some easy numbers like 0, 1, -1 etc.

Consider these two cases:
Case #2: a = 1 and b = 1
Quantity A: a/b = 1/1 = 1
Quantity B: (a+3)/(b+3) = (1+3)/(1+3) = 4/4 = 1
Since the two quantities are EQUAL, the correct answer is either C or D

Now try some other values of a and b:
Case #2: a = 1 and b = 2
Quantity A: a/b = 1/2
Quantity B: (a+3)/(b+3) = (1+3)/(2+3) = 4/5
Since the two quantities are NOT EQUAL, the correct answer is D

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com

Last edited by GreenlightTestPrep on 18 May 2015, 11:25, edited 1 time in total.
Manager
Joined: 17 Feb 2015
Posts: 107
Followers: 3

Kudos [?]: 28 [0], given: 6

Re: GRE Math Challenge #71 [#permalink]  03 May 2015, 21:52
#Sandy this is not a challenge, it can be a practice question.....
Manager
Joined: 03 Dec 2017
Posts: 65
Followers: 0

Kudos [?]: 15 [0], given: 20

Re: GRE Math Challenge #71- (a/b) or (a+3)/(b+3) [#permalink]  17 Jan 2018, 00:06
since there is no restriction for a / b (i mean like a>1 b>a , this kind of restriction)
Intern
Joined: 24 Jan 2018
Posts: 31
Followers: 0

Kudos [?]: 4 [0], given: 8

Re: GRE Math Challenge #71- (a/b) or (a+3)/(b+3) [#permalink]  26 Jan 2018, 10:24
D
Intern
Joined: 09 Aug 2018
Posts: 1
Followers: 0

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

Re: GRE Math Challenge #71- (a/b) or (a+3)/(b+3) [#permalink]  09 Aug 2018, 09:59
Why would you not assume different numbers for the variables a & b. If you assume a & b are the number 1, would they not be the same variable since they are the same number?
Re: GRE Math Challenge #71- (a/b) or (a+3)/(b+3)   [#permalink] 09 Aug 2018, 09:59
Display posts from previous: Sort by