Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 16 Jul 2019, 19:41

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.

Close

Request Expert Reply

Confirm Cancel

The average American spends y dollars on food per month, except during

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Manager
Manager
avatar
G
Joined: 27 Jan 2016
Posts: 127
Schools: ISB '18
GMAT 1: 700 Q50 V34
The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 29 Jul 2017, 01:19
3
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

73% (01:48) correct 27% (01:57) wrong based on 207 sessions

HideShow timer Statistics


The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following represents food purchases, in dollars, for the first 9 months of a year?


A)9y – xy/100

B)9y + xy

C)9y – xy

D)(9y-xy)/9

E)y-xy/6
Intern
Intern
User avatar
B
Joined: 03 Feb 2017
Posts: 25
Re: The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 29 Jul 2017, 01:48
1
Spends in Jan = (y - xy/100)
In other 8 months 8y

Total 8y + (y - xy/100)
=9y - xy/100 --A
Senior SC Moderator
avatar
V
Joined: 22 May 2016
Posts: 3063
The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 29 Jul 2017, 11:06
1
srikanth9502 wrote:
The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following reepresents food purchases, in dollars, for the first 9 months of a year?

A)9y – xy/100

B)9y + xy

C)9y – xy

D)(9y-xy)/9

E)y-xy/6

Assign values.

Let y dollars per month be 10
Let x percent less for January be 10

Eight month total is (8 * 10) = $80
January total is (.90)(10) = $9
Total for nine months = $89

With y = 10 and x = 10, find the answer choice that yields $89.

Answers B, C, D, and E can be eliminated quickly.

Answer B is 9y + xy. 9y = (9*10) = 90 is too high already. Adding anything will make it higher.

Answer C, 9y – xy. Easy and quick calculation shows result is negative.
(9*10) + (10*10) =
(90) - (100) = -10

If C is negative, then Answer D, (9y-xy)/9, is too. Its numerator is identical to answer C.

If C is negative with (9y - xy), then Answer E's numerator, 1y - xy, will be more negative.

Answer A, which initially looked strange because I read the denominator incorrectly, remains: 9y – xy/100

(9 * 10) - \(\frac{(10*10)}{100}\) =

90 - 1 = 89
Answer A
_________________
SC Butler has resumed!
Get two SC questions to practice, whose links you can find by date, here.


Tell me, what is it you plan to do with your one wild and precious life? -- Mary Oliver
Intern
Intern
avatar
B
Joined: 04 Aug 2017
Posts: 10
Re: The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 12 Aug 2017, 12:48
The amount for nine months: 9y

The amount for the January: y(x/100) = xy/100

What we're looking for is the amount spent for the first eight months of the year which would be the difference between nine months and the amount spent in January. This can be written algebraically as: 9y - xy/100

Which is answer choice A.
Intern
Intern
avatar
Joined: 01 Sep 2018
Posts: 1
The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 13 Jan 2019, 09:01
Just fell over this question and I'm wondering why C isn't the right answer. (9*10 - 0.1*10 = 89)

My approach was the exact same as generis', with the exception that I Plugged in 0.1 for x, because in the statement it says x=percent.

Why do I have to plug in 10 now? I don't get it.
CEO
CEO
User avatar
V
Joined: 12 Sep 2015
Posts: 3847
Location: Canada
Re: The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 20 Jan 2019, 06:45
Top Contributor
srikanth9502 wrote:
The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following represents food purchases, in dollars, for the first 9 months of a year?


A)9y – xy/100

B)9y + xy

C)9y – xy

D)(9y-xy)/9

E)y-xy/6


This is a Variables in the Answer Choices question (VIAC). This question type can be answered algebraically or using the INPUT-OUTPUT approach.
Let's solve the question algebraically.

The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months.
In other words, January's food purchase amount is x percent less than y
x percent = x/100
So, x percent of y = (x/100)(y) = xy/100
So, January's food purchase amount = y - xy/100

Which of the following represents food purchases, in dollars, for the first 9 months of a year?
January's food purchase amount = y - xy/100
The food purchase amount for EACH of the other 8 months = y

So, the TOTAL cost = y - xy/100 + y + y + y + y + y + y + y + y
= y - xy/100 + 8y
= 9y - xy/100

Answer: A

Cheers,
Brent

RELATED VIDEO FROM OUR COURSE

_________________
Test confidently with gmatprepnow.com
Image
Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4512
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User
Re: The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 20 Jan 2019, 07:34
srikanth9502 wrote:
The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following represents food purchases, in dollars, for the first 9 months of a year?


A)9y – xy/100

B)9y + xy

C)9y – xy

D)(9y-xy)/9

E)y-xy/6


Plug in some values and check...

Let y = 100 & y = 10

So, Feb to September , monthly expenses is 100*8 = 800

Expenses in January is 90

So, The total expense for the first 9 month is 800 + 90 = 890

NOw, Check the options -

(A) 9y – xy/100 = 9*100 -10*100/100 => 890 ; Thus, Answer must be (A)
_________________
Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )
VP
VP
avatar
G
Joined: 09 Mar 2018
Posts: 1002
Location: India
Re: The average American spends y dollars on food per month, except during  [#permalink]

Show Tags

New post 20 Jan 2019, 08:47
srikanth9502 wrote:
The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following represents food purchases, in dollars, for the first 9 months of a year?


A)9y – xy/100

B)9y + xy

C)9y – xy

D)(9y-xy)/9

E)y-xy/6


Let the average American spends 10 dollars on food per month

January, when food purchases are 10 percent lower than they are in other months

For the first 9 months of a year, following represents food purchases
80 + 10% 90 = 89

I was looking for a relationship in which a reduction was been made, B and C removed

D is / something by 9 ->Will reduce the value further Out

E is / something by 6 ->Will reduce the value further Out
A)9y – xy/100
90 - 10* 10/100
= 89
_________________
If you notice any discrepancy in my reasoning, please let me know. Lets improve together.

Quote which i can relate to.
Many of life's failures happen with people who do not realize how close they were to success when they gave up.
GMAT Club Bot
Re: The average American spends y dollars on food per month, except during   [#permalink] 20 Jan 2019, 08:47
Display posts from previous: Sort by

The average American spends y dollars on food per month, except during

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





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