Author 
Message 
TAGS:

Hide Tags

Retired Moderator
Joined: 29 Apr 2015
Posts: 853
Location: Switzerland
Concentration: Economics, Finance
WE: Asset Management (Investment Banking)

When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
30 May 2015, 05:24
Question Stats:
69% (02:00) correct 31% (02:53) wrong based on 155 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.
Official Answer and Stats are available only to registered users. Register/ Login.
_________________
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.




Manager
Joined: 21 Feb 2012
Posts: 59

Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
30 May 2015, 23:10
Hello retorate 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 % \(difference\) \(=\) \(\frac{(4520)}{20} * 100\) \(=\) \(125\)% That's option \(C\)
_________________
Regards J
Do consider a Kudos if you find the post useful




GMAT Tutor
Joined: 24 Jun 2008
Posts: 1344

Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
30 May 2015, 13:03
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
Joined: 02 Aug 2009
Posts: 6802

Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
30 May 2015, 23:19
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
_________________
1) Absolute modulus : http://gmatclub.com/forum/absolutemodulusabetterunderstanding210849.html#p1622372 2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html 3) effects of arithmetic operations : https://gmatclub.com/forum/effectsofarithmeticoperationsonfractions269413.html
GMAT online Tutor



Intern
Joined: 10 Jan 2015
Posts: 3

Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
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 (94 = 5 lb ) more in 6 mins or (5/4)*100 =125 %



Senior Manager
Status: Math is psychological
Joined: 07 Apr 2014
Posts: 421
Location: Netherlands
GMAT Date: 02112015
WE: Psychology and Counseling (Other)

Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
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 (94/4) * 100 = 1.25 * 100 = 125%.



Board of Directors
Joined: 17 Jul 2014
Posts: 2683
Location: United States (IL)
Concentration: Finance, Economics
GPA: 3.92
WE: General Management (Transportation)

Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
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 4520 = 25 25/20 = 100%+ smth. all out except for C.



VP
Joined: 07 Dec 2014
Posts: 1088

When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
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
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 3515
Location: United States (CA)

Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy
[#permalink]
Show Tags
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 WoodburyStewart
Founder and CEO
GMAT Quant SelfStudy Course
500+ lessons 3000+ practice problems 800+ HD solutions




Re: When Tom works alone he chops 2 lb. salad in 3 minutes, and when Tammy &nbs
[#permalink]
21 Jan 2018, 20:04






