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

It is currently 16 Oct 2019, 23:14

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

How long would it take Joan to count the books in a small library?

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58393
How long would it take Joan to count the books in a small library?  [#permalink]

Show Tags

New post 24 Jan 2016, 05:37
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

91% (00:36) correct 9% (00:49) wrong based on 104 sessions

HideShow timer Statistics

Manager
Manager
avatar
Joined: 03 Jan 2015
Posts: 72
GMAT ToolKit User
Re: How long would it take Joan to count the books in a small library?  [#permalink]

Show Tags

New post 24 Jan 2016, 14:06
I believe answer C.


(1) She counts twice as fast as Emily.

J = 2E. Not sufficient
(2) Working together, Joan and Emily count the books in 26 hours.
J + E = 26. Not sufficient

Together, you can solve for J. Answer choice C.
SVP
SVP
User avatar
V
Joined: 26 Mar 2013
Posts: 2347
Reviews Badge CAT Tests
Re: How long would it take Joan to count the books in a small library?  [#permalink]

Show Tags

New post 25 Jan 2016, 01:38
Bunuel wrote:
How long would it take Joan to count the books in a small library?

(1) She counts twice as fast as Emily.
(2) Working together, Joan and Emily count the books in 26 hours.


combines Rate (R) = RJ + RE; RJ=Joan rate & RE=Emily rate

1) RJ=2RE ......Ins

2)Combines Rate= 1/26....ins

Combined 1& 2

RJ+RE=1/26....> 1/26= RJ+ 1/2 (RE)..............Suf

Answer: C
Intern
Intern
User avatar
Joined: 11 Jan 2014
Posts: 25
Location: Viet Nam
Concentration: Accounting, Finance
GPA: 3.17
WE: Analyst (Accounting)
Re: How long would it take Joan to count the books in a small library?  [#permalink]

Show Tags

New post 25 Jan 2016, 13:33
Bunuel wrote:
How long would it take Joan to count the books in a small library?

(1) She counts twice as fast as Emily.
(2) Working together, Joan and Emily count the books in 26 hours.


One C for me.
(1) We did not know how long Emily took to count the books in the lib --> insufficient.
(2) We did not know the rate between Emily and Joan in counting the books--> insufficient.
(1) & (2)--> support to each other
_________________
Never forget what you are fighting for...
and when your mind and your body tell you to quit. Your heart will tell you to fight.
Intern
Intern
avatar
Joined: 22 Oct 2015
Posts: 17
Re: How long would it take Joan to count the books in a small library?  [#permalink]

Show Tags

New post 04 Feb 2016, 10:35
1
I am really bad at these sorts of problems so could someone check to see if this is correct?

Given that I understand that both statements together are sufficient, is the math correct?

1. She counts twice as fast as Emily.
Joans rate is \(\frac{1}{x}\) and Emilys rate is \(\frac{1}{x}*\frac{1}{2}\) because it is half of Joans

2.Working together, Joan and Emily count the books in 26 hours.

\(\frac{1}{26}=\frac{1}{x}+\frac{1}{2x}\)
\(\frac{1}{26}=\frac{3}{2x}\)
\(78=2x\)
\(x=39\)

Joans rate is \(\frac{1}{39}\) and Emilys rate is \(\frac{1}{78}\)
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13204
Re: How long would it take Joan to count the books in a small library?  [#permalink]

Show Tags

New post 17 Oct 2018, 10:25
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Bot
Re: How long would it take Joan to count the books in a small library?   [#permalink] 17 Oct 2018, 10:25
Display posts from previous: Sort by

How long would it take Joan to count the books in a small library?

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





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