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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

During a sale, a clothing store sold each shirt at a price [#permalink]

Show Tags

30 Aug 2009, 07:01

1

This post received KUDOS

6

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

80% (01:58) correct
20% (01:41) wrong based on 209 sessions

HideShow timer Statistics

During a sale, a clothing store sold each shirt at a price of $15 and each sweater at a price of $25. Did the store sell more sweaters than shirts during the sale? (1) The average (arithmetic mean) of the prices of all the shirts and sweaters that the store sold during the sale was $21. (2) The total of the prices of all the shirts and sweaters that the store sold during the sale was $420.

In the xy-plane, does the line with equation y=3x+2 contain the point(r,s)? (1) (3r+2-s)(4r+9-s)=0 (2) (4r-6-s)(3r+2-s)=0

Re: GMAT Practice Test answer explanations - DS [#permalink]

Show Tags

30 Aug 2009, 08:11

2) In the xy plane, does the line with the equation y = 3x + 2 contain the point (r,s)? 1) (3r + 2 - s)(4r + 9 - s) = 0 2) (4r + 6 - s)(3r + 2 - s) = 0

The line y = 3x + 2 contains the point means it passes through (r,s)

=> it should satisfy the equation.

=> s = 3r +2 or, 3r + 2 - s = 0 --- equation 1st...

1.) (3r + 2 - s)(4r + 9 - s) = 0

It is possible when (3r + 2 - s) = 0 or (4r + 9 - s) = 0 if (3r + 2 - s) = 0, then , (r,s) satisfies the equation ( from 1st) but if, (4r + 9 - s) = 0 then, we can not be sure that (r,s) satisfies the equation ( from 1st) Hence, insufficient..

2.) Same as 1

Combining both,

both are possible only when (3r + 2 - s) = 0 ..Hence, (r,s) lies on the line..

Re: GMAT Practice Test answer explanations - DS [#permalink]

Show Tags

30 Aug 2009, 09:08

First question.

Without any equations and thinking logically, it can be shown that the stmt 1 is sufficient. The average price is 21. Price per shirt =15, price per sweater = 25. If the equal quantity of shirts and sweater was sold, then the average would be 20. Since average is greater than 20, the store sold more items with higher price - sweaters.

Re: GMAT Practice Test answer explanations - DS [#permalink]

Show Tags

22 Nov 2009, 18:54

gmate2010 wrote:

2) In the xy plane, does the line with the equation y = 3x + 2 contain the point (r,s)? 1) (3r + 2 - s)(4r + 9 - s) = 0 2) (4r + 6 - s)(3r + 2 - s) = 0

The line y = 3x + 2 contains the point means it passes through (r,s)

=> it should satisfy the equation.

=> s = 3r +2 or, 3r + 2 - s = 0 --- equation 1st...

1.) (3r + 2 - s)(4r + 9 - s) = 0

It is possible when (3r + 2 - s) = 0 or (4r + 9 - s) = 0 if (3r + 2 - s) = 0, then , (r,s) satisfies the equation ( from 1st) but if, (4r + 9 - s) = 0 then, we can not be sure that (r,s) satisfies the equation ( from 1st) Hence, insufficient..

2.) Same as 1

Combining both,

both are possible only when (3r + 2 - s) = 0 ..Hence, (r,s) lies on the line..

Hence, sufficient.. C is the answer..

I have the question

the question stem itself gives us the info that 3r+2-s = 0

so from statement 1, applying question stem, the equation statisfies irrespective of of what (4r + 9 - s) is.

Re: GMAT Practice Test answer explanations - DS [#permalink]

Show Tags

14 Dec 2009, 20:17

ISBtarget wrote:

gmate2010 wrote:

2) In the xy plane, does the line with the equation y = 3x + 2 contain the point (r,s)? 1) (3r + 2 - s)(4r + 9 - s) = 0 2) (4r + 6 - s)(3r + 2 - s) = 0

The line y = 3x + 2 contains the point means it passes through (r,s)

=> it should satisfy the equation.

=> s = 3r +2 or, 3r + 2 - s = 0 --- equation 1st...

1.) (3r + 2 - s)(4r + 9 - s) = 0

It is possible when (3r + 2 - s) = 0 or (4r + 9 - s) = 0 if (3r + 2 - s) = 0, then , (r,s) satisfies the equation ( from 1st) but if, (4r + 9 - s) = 0 then, we can not be sure that (r,s) satisfies the equation ( from 1st) Hence, insufficient..

2.) Same as 1

Combining both,

both are possible only when (3r + 2 - s) = 0 ..Hence, (r,s) lies on the line..

Hence, sufficient.. C is the answer..

I have the question

the question stem itself gives us the info that 3r+2-s = 0

so from statement 1, applying question stem, the equation statisfies irrespective of of what (4r + 9 - s) is.

same for statement 2 as well, so i chose D

I think from statement one 3r+2-s may be 0 or second part may be zero...similarly for statement 2, combining both will prove that 3r+2-s is zero

Re: GMAT Practice Test answer explanations - DS [#permalink]

Show Tags

28 Mar 2012, 07:53

from statement 2,

shirts x sweaters y

15x +20y = 420

Can we say that since 60 is a common multiple between the 15 and 20, there will be more than one answer that can satisfy the equation? If there is a common multiple for

Can we say that since 60 is a common multiple between the 15 and 20, there will be more than one answer that can satisfy the equation? If there is a common multiple for

Not sure that I understand your question correctly but generally for such kind of question it's always better to check whether an equation whose solution must be integers only has one or more set of variables satisfying it.

During a sale, a clothing store sold each shirt at a price of $15 and each sweater at a price of $25. Did the store sell more sweaters than shirts during the sale?

(1) The average (arithmetic mean) of the prices of all the shirts and sweaters that the store sold during the sale was $21 --> since the average sale price of $21 is closer to $25 than to $15 then store sold more sweaters than shirts (sweaters have more weight in the weighted average and thus pulled it closer to $21). Sufficient.

(2) The total of the prices of all the shirts and sweaters that the store sold during the sale was $420 --> 15x + 25y =420 --> 3x+5y=84. If x=8 and y=12 then x<y but if x=13 and y=5 then x>y. Not sufficient.

In the XY plane, does the line with equation y=3x+2 contain the point (r,s)?

Line with equation \(y=3x+2\) contains the point \((r,s)\) means that when substituting \(r\) ans \(s\) in line equation: \(s=3r+2\) (or \(3r+2-s=0\)) holds true.

So basically we are asked to determine whether \(3r+2-s=0\) is true or not.

(1) \((3r+2-s)(4r+9-s)=0\) --> either \(3r+2-s=0\) OR \(4r+9-s=0\) OR both. Not sufficient.

(2) \((4r-6-s)(3r+2-s)=0\) --> either \(3r+2-s=0\) OR \(4r-6-s=0\) OR both. Not sufficient.

(1)+(2) Both \(4r+9-s=0\) and \(4r-6-s=0\) can not be true (simultaneously), as \(4r-s\) can not equal to both -9 and 6, hence \(3r+2-s=0\) must be true. Sufficient.

Re: During a sale, a clothing store sold each shirt at a price [#permalink]

Show Tags

09 Sep 2013, 07:58

Dear Bunuel,

For following statement, you provided two different sets of values for x,y. I tried to identify these values by simply plugging multiples of one variable, but this approach is taking more than 2min, is there any method or trick related to lcm or any thing which we can use to quickly identify all possible values for the equation? I am really struggling with this hit and trial approach, what we should look for while selecting these values.

(2) The total of the prices of all the shirts and sweaters that the store sold during the sale was $420 --> 15x + 25y =420 --> 3x+5y=84. If x=8 and y=12 then x<y but if x=13 and y=5 then x>y. Not sufficient.

Thanks
_________________

Piyush K ----------------------- Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time. ― Thomas A. Edison Don't forget to press--> Kudos My Articles: 1. WOULD: when to use?| 2. All GMATPrep RCs (New) Tip: Before exam a week earlier don't forget to exhaust all gmatprep problems specially for "sentence correction".

gmatclubot

Re: During a sale, a clothing store sold each shirt at a price
[#permalink]
09 Sep 2013, 07:58