The total cost an office dinner was shared equally by k of the n employees who attended the dinner. What was the total cost of the dinner?
A) each of the k employees who shared the cost of the dinner paid $19.
b) if the total cost of the dinner had been shared equally by k+1 of the employees who attended the dinner,each of the k+1 employees would have paid $18.
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
total cost of the dinner? DS problem
This topic has expert replies
-
kishokbabu
- Senior | Next Rank: 100 Posts
- Posts: 62
- Joined: Wed May 04, 2011 9:50 pm
- Thanked: 2 times
- Followed by:2 members
-
jarvis
- Junior | Next Rank: 30 Posts
- Posts: 12
- Joined: Mon Dec 26, 2011 11:44 am
- Followed by:1 members
Answer - C
Explanation -
Total Cost of Dinner(TCoD) from statement A = k*19 - does not give any number, so A alone is not sufficient
TCoD from statement B = (k+1)*18 - does not give any number, so B alone is not sufficient
Both together -
k*19 = (k+1)*18
We can solve for k and find the total cost.
Explanation -
Total Cost of Dinner(TCoD) from statement A = k*19 - does not give any number, so A alone is not sufficient
TCoD from statement B = (k+1)*18 - does not give any number, so B alone is not sufficient
Both together -
k*19 = (k+1)*18
We can solve for k and find the total cost.
GMAT/MBA Expert
-
Anurag@Gurome
- GMAT Instructor
- Posts: 3835
- Joined: Fri Apr 02, 2010 10:00 pm
- Location: Milpitas, CA
- Thanked: 1854 times
- Followed by:523 members
- GMAT Score:770
Let the total cost of the dinner = Tkishokbabu wrote:The total cost an office dinner was shared equally by k of the n employees who attended the dinner. What was the total cost of the dinner?
A) each of the k employees who shared the cost of the dinner paid $19.
b) if the total cost of the dinner had been shared equally by k+1 of the employees who attended the dinner,each of the k+1 employees would have paid $18.
(1) T = 19 * k. There is one equation and two variables; NOT sufficient.
(2) T = 18(k + 1). Again, there is one equation and two variables; NOT sufficient.
Combining (1) and (2), 19k = 18k + 18 or k = 18, so now T can be found; SUFFICIENT.
The correct answer is C.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)
Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)
Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
-
ArunangsuSahu
- Master | Next Rank: 500 Posts
- Posts: 382
- Joined: Thu Mar 31, 2011 5:47 pm
- Thanked: 15 times
(A) Total Cost =19k. k is unknown. So INSUFFICIENT
(B) Total Cost =18(k+1). k is unknown . So INSUFFICIENT
Combining We can find k. So SUFFICIENT and (C) is the answer
(B) Total Cost =18(k+1). k is unknown . So INSUFFICIENT
Combining We can find k. So SUFFICIENT and (C) is the answer
