It is currently 11 Dec 2018, 05:05
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 #37-A retail business has determined

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1653 [0], given: 396

CAT Tests
GRE Math Challenge #37-A retail business has determined [#permalink] New post 19 Sep 2014, 03:46
Expert's post
00:00

Question Stats:

72% (01:13) correct 27% (00:46) wrong based on 43 sessions
A retail business has determined that its net income, in terms of x, the number of items sold, is given by the expression x^2 + x - 380.

Column A: The number of items to be sold for the net income to be zero

Column B: 10

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.
[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

1 KUDOS received
GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 1232
Followers: 45

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

Re: GRE Math Challenge #37 [#permalink] New post 10 Apr 2015, 08:07
1
This post received
KUDOS
Expert's post
sandy wrote:
A retail business has determined that its net income, in terms of x, the number of items sold, is given by the expression x^2 + x - 380.

Column A: The number of items to be sold for the net income to be zero

Column B: 10

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.


Column A: If the net income = 0, then x² + x - 380 = 0
Let's solve this equation by factoring: (x + 20)(x - 19) = 0
So, x = -20 or x = 19
Since x (the number of items sold) cannot be NEGATIVE, we can be certain that x = 19
So, Column A = 19
Column B = 10

Correct answer:
[Reveal] Spoiler:
A


Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com
Image
Sign up for our free GRE Question of the Day emails

Manager
Manager
Joined: 27 Sep 2017
Posts: 112
Followers: 1

Kudos [?]: 29 [0], given: 4

Re: GRE Math Challenge #37-A retail business has determined [#permalink] New post 11 Mar 2018, 06:13
sandy wrote:
A retail business has determined that its net income, in terms of x, the number of items sold, is given by the expression x^2 + x - 380.

Column A: The number of items to be sold for the net income to be zero

Column B: 10

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.


First of all, we had to know that items can NOT be negative.

Then, for the net income \(x^{2}\) + x - 380 to be 0. We can do the factorization (x+20)(x-19). We get x=19 or -20.

since items can not be negative. Quant A is 20 which is bigger than Quant B (10).
Re: GRE Math Challenge #37-A retail business has determined   [#permalink] 11 Mar 2018, 06:13
Display posts from previous: Sort by

GRE Math Challenge #37-A retail business has determined

  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®.