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

It is currently 18 Oct 2019, 11:56

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

When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy

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

Hide Tags

Find Similar Topics 
Retired Moderator
avatar
Joined: 29 Apr 2015
Posts: 822
Location: Switzerland
Concentration: Economics, Finance
Schools: LBS MIF '19
WE: Asset Management (Investment Banking)
GMAT ToolKit User
When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 30 May 2015, 05:24
1
5
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

70% (02:33) correct 30% (02:52) wrong based on 167 sessions

HideShow timer Statistics

When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy works alone she chops 3 lb. salad in 2 minutes. They start working together, and after some time finish chopping 65 lb. of salad. Of those 65 lb., the salad quantity chopped by Tammy is what percent greater than the quantity chopped by Tom?

A. 44%
B. 100%
C. 125%
D. 225%
E. 400%


Trap Answer D:
This is the right answer for the wrong question. If the question were phrased as follows:

The quantity chopped by Tammy is what percent of the quantity chopped by Tom?", then 9 is indeed 225% of 4. However, the presence of the word "greater" means that the question asks about the difference between the two, as a percent of Tom's quantity.

_________________
Saving was yesterday, heat up the gmatclub.forum's sentiment by spending KUDOS!

PS Please send me PM if I do not respond to your question within 24 hours.
Most Helpful Community Reply
Manager
Manager
User avatar
Joined: 21 Feb 2012
Posts: 56
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 30 May 2015, 23:10
4
2
Hello reto

rate of Tom = \(\frac{2}{3}\) lb per min
rate of Tammy = \(\frac{3}{2}\) lb per min

Fitting it into the given equation

\(\frac{2}{3} * t + \frac{3}{2} * t = 65\)

\(t = 30\)

Tom makes \(\frac{2}{3} * 30 = 20\) lb
Tammy makes \(\frac{3}{2} * 30 = 45\) lb

% \(difference\) \(=\) \(\frac{(45-20)}{20} * 100\) \(=\) \(125\)%

That's option \(C\)
_________________
Regards
J

Do consider a Kudos if you find the post useful
General Discussion
GMAT Tutor
avatar
G
Joined: 24 Jun 2008
Posts: 1806
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 30 May 2015, 13:03
1
3
Get the same time for both:

Tom chops 4 lbs in 6 minutes
Tammy chops 9 lbs in 6 minutes

So in the same amount of time, Tammy chops 125% more than Tom, since 9 is 125% greater than 4. So 125% is the answer.

Note that the actual time doesn't matter. If you multiply the time each work by x, you'll multiply the work each does by x, and 9x is still 125% greater than 4x.
_________________
GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com
Math Expert
avatar
V
Joined: 02 Aug 2009
Posts: 7978
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 30 May 2015, 23:19
1
reto wrote:
When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy works alone she chops 3 lb. salad in 2 minutes. They start working together, and after some time finish chopping 65 lb. of salad. Of those 65 lb., the salad quantity chopped by Tammy is what percent greater than the quantity chopped by Tom?

A. 44%
B. 100%
C. 125%
D. 225%
E. 400%


Trap Answer D:
This is the right answer for the wrong question. If the question were phrased as follows:

The quantity chopped by Tammy is what percent of the quantity chopped by Tom?", then 9 is indeed 225% of 4. However, the presence of the word "greater" means that the question asks about the difference between the two, as a percent of Tom's quantity.


hi,
we dont require to worry about 65 lbs as we have been given the speed of both and we can work out answer from it..
take LCM of tme 2,3=6 mins
in 6 tammy would do 3*3=9..
in 6 min, tom would do 2*2=4.
difference / speed=5/4=125%..
you are correct that the wordings does not give us D as the ans
_________________
Intern
Intern
avatar
Joined: 10 Jan 2015
Posts: 2
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 31 May 2015, 05:58
Tom = Chops 2 lb in 3 mins or it can be written as 4 lb in 6 min

Tim = Chops 3 lb in 2 mins or it can be written as 9 lb in 6 mins

So, Tim chops (9-4 = 5 lb ) more in 6 mins or (5/4)*100 =125 %
Senior Manager
Senior Manager
User avatar
Status: Math is psycho-logical
Joined: 07 Apr 2014
Posts: 402
Location: Netherlands
GMAT Date: 02-11-2015
WE: Psychology and Counseling (Other)
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 22 Jun 2015, 02:20
I also calcuated their combined rate:

2/3 + 3/2 = 4/6 + 9/6 = 13/6.
So, (to find the % difference) if we take 13 as the whole then (9-4/4) * 100 = 1.25 * 100 = 125%.
Board of Directors
User avatar
P
Joined: 17 Jul 2014
Posts: 2509
Location: United States (IL)
Concentration: Finance, Economics
GMAT 1: 650 Q49 V30
GPA: 3.92
WE: General Management (Transportation)
GMAT ToolKit User Reviews Badge
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 09 May 2016, 19:27
reto wrote:
When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy works alone she chops 3 lb. salad in 2 minutes. They start working together, and after some time finish chopping 65 lb. of salad. Of those 65 lb., the salad quantity chopped by Tammy is what percent greater than the quantity chopped by Tom?

A. 44%
B. 100%
C. 125%
D. 225%
E. 400%


my approach..though took some extra time to double check.
Tom's rate 2/3
Tammy's rate 3/2

rate together: 2/3+3/2 = 13/6
they chopped 65 lb.
they chopped 65 lb in 65*6/13 = 5*6 = 30 minutes.
we know Tom's rate, we have his time, so we can solve for the work done.
2/3 * 30 = 20 lb chopped.
therefore, Tammy must have chopped 45 lb.

we are asked PERCENT GREATER
45-20 = 25
25/20 = 100%+ smth.
all out except for C.
VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1222
When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post Updated on: 22 Jan 2018, 10:52
When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy works alone she chops 3 lb. salad in 2 minutes. They start working together, and after some time finish chopping 65 lb. of salad. Of those 65 lb., the salad quantity chopped by Tammy is what percent greater than the quantity chopped by Tom?

A. 44%
B. 100%
C. 125%
D. 225%
E. 400%

Tammy's rate/Tom's rate=(3/2)/(2/3)=9/4
9/4=2.25=125% increase in Tammy's rate over Tom's
C

Originally posted by gracie on 09 May 2016, 22:15.
Last edited by gracie on 22 Jan 2018, 10:52, edited 1 time in total.
Target Test Prep Representative
User avatar
D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8104
Location: United States (CA)
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy  [#permalink]

Show Tags

New post 21 Jan 2018, 20:04
reto wrote:
When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy works alone she chops 3 lb. salad in 2 minutes. They start working together, and after some time finish chopping 65 lb. of salad. Of those 65 lb., the salad quantity chopped by Tammy is what percent greater than the quantity chopped by Tom?

A. 44%
B. 100%
C. 125%
D. 225%
E. 400%


We use the “percent greater than” formula: (Tammy’s rate - Tom’s rate)/Tom’s rate x 100%.

Since Tom’s rate is 2/3 and Tammy’s rate is 3/2, when they work together, Tammy’s work will always be:

(3/2 - 2/3)/2/3 x 100

(9/6 - 4/6)/2/3 x 100

(5/6)/(2/3) x 100 = 5/6 x 3/2 x 100 = 15/12 x 100 = 5/4 x 100 = 125% greater than Tom’s.

Answer: C
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

GMAT Club Bot
Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy   [#permalink] 21 Jan 2018, 20:04
Display posts from previous: Sort by

When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy

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





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