GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 21 Jan 2019, 12:54

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
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • GMAT Club Tests are Free & Open for Martin Luther King Jr.'s Birthday!

     January 21, 2019

     January 21, 2019

     10:00 PM PST

     11:00 PM PST

    Mark your calendars - All GMAT Club Tests are free and open January 21st for celebrate Martin Luther King Jr.'s Birthday.
  • The winners of the GMAT game show

     January 22, 2019

     January 22, 2019

     10:00 PM PST

     11:00 PM PST

    In case you didn’t notice, we recently held the 1st ever GMAT game show and it was awesome! See who won a full GMAT course, and register to the next one.

If Ted brought n baseball cards costs $3 each, then brought twice as

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

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52344
If Ted brought n baseball cards costs $3 each, then brought twice as  [#permalink]

Show Tags

New post 01 Jan 2018, 09:21
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

83% (01:09) correct 17% (01:30) wrong based on 18 sessions

HideShow timer Statistics

If Ted brought n baseball cards costs $3 each, then brought twice as many cards baseball cards at $9 each, then the average (arithmetic mean) cost, in dollars per baseball card, is equal to

A. 4n
B. 9
C. 7n
D. 6/n
E. 7

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Intern
Intern
avatar
B
Joined: 28 Dec 2017
Posts: 31
Re: If Ted brought n baseball cards costs $3 each, then brought twice as  [#permalink]

Show Tags

New post 01 Jan 2018, 17:08
[(3*N) + (9*2N)] / (3*N)
I got this first equation because there are initially N baseball cards at $3 each, and then twice as many baseball cards (2N) at $9 each. I added those two together to get the total cost that Ted spent buying baseball cards [(3*N) + (9*2N)]. To find the average, I divided that total cost by the number of baseball cards, (3*N,) which I got by adding N + 2N.

Simplifying that equation, I got (21*N)/(3*N)
Cancelling out the two N variables, I got 7 as the final answer (option E).
Senior SC Moderator
avatar
V
Joined: 22 May 2016
Posts: 2357
Re: If Ted brought n baseball cards costs $3 each, then brought twice as  [#permalink]

Show Tags

New post 03 Jan 2018, 15:41
Bunuel wrote:
If Ted brought n baseball cards costs $3 each, then brought twice as many cards baseball cards at $9 each, then the average (arithmetic mean) cost, in dollars per baseball card, is equal to

A. 4n
B. 9
C. 7n
D. 6/n
E. 7

Average cost in dollars = \(\frac{TotalCost}{TotalQty}\)

Total Cost = (Qty\(_1\))(Cost\(_1\)) + (Qty\(_2\))(Cost\(_2\))

(Qty\(_1\))(Cost\(_1\)): \(n\) baseball cards that cost $3 each = n($3)
(Qty\(_2\))(Cost\(_2\)): twice as many cards (as \(n\)) that cost $9 each = 2n($9)

Total Cost in dollars: n(3) + 2n(9)
Total Qty: (n + 2n) = 3n

Average cost in dollars =
\(\frac{n(3) + 2n(9)}{3n}=\frac{3n+18n}{3n}=\frac{21n}{3n}=7\)

Answer E
_________________

Life’s like a movie. Write your own ending.

Kermit the Frog

Manager
Manager
User avatar
G
Joined: 22 May 2015
Posts: 108
If Ted brought n baseball cards costs $3 each, then brought twice as  [#permalink]

Show Tags

New post Updated on: 03 Jan 2018, 19:53
Turkish similar average problem. Here Avg Cost = Total Cost / Total cards

Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
_________________

Consistency is the Key


Originally posted by laddaboy on 03 Jan 2018, 17:44.
Last edited by laddaboy on 03 Jan 2018, 19:53, edited 1 time in total.
Intern
Intern
avatar
Joined: 09 Sep 2017
Posts: 5
Location: Viet Nam
Schools: Erasmus '19
GMAT 1: 660 Q50 V28
GPA: 3.71
Re: If Ted brought n baseball cards costs $3 each, then brought twice as  [#permalink]

Show Tags

New post 03 Jan 2018, 18:52
Bunuel wrote:
If Ted brought n baseball cards costs $3 each, then brought twice as many cards baseball cards at $9 each, then the average (arithmetic mean) cost, in dollars per baseball card, is equal to

A. 4n
B. 9
C. 7n
D. 6/n
E. 7


Avr cost = (Total cost)/(Number of items)=(3*n+9*2n)/(n+2n)=21n/3n=7
Therefore, E is correct answer
GMAT Club Bot
Re: If Ted brought n baseball cards costs $3 each, then brought twice as &nbs [#permalink] 03 Jan 2018, 18:52
Display posts from previous: Sort by

If Ted brought n baseball cards costs $3 each, then brought twice as

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.