Search found 216 matches
- by California4jx
Mon Jul 27, 2009 1:38 pm- Forum: Problem Solving
- Topic: Relative rates .. similar approach different answers
- Replies: 3
- Views: 1823
Relative rates .. similar approach different answers
Car A and car B travel around a circular park with a radius of 20 miles. Both cars leaves from the same point. Car A travels counter-clockwise at 60 miles per hour and car B travels clockwise at 40 miles per hour. Car B leaves 20 minutes after car A. Approximately how many minutes does it tak for th...
- by California4jx
Mon Jul 27, 2009 12:56 pm- Forum: Problem Solving
- Topic: Relative rates .. similar approach different answers
- Replies: 3
- Views: 1823
Get Back up ..
very inspirational to get you back on GMAT track if for some reason you couldnt achieve your target score ..
http://www.youtube.com/watch?v=MslbhDZoniY
- by California4jx
Wed Jul 08, 2009 1:57 am- Forum: GMAT Strategy
- Topic: Get Back up ..
- Replies: 0
- Views: 1017
IMO you don't need any math here to solve the problem. you can notice in the diagram, to be a 90 degree angle, the two points must be in reverse order with respect to the quadrant they are in. think about (1,0 and 0,1) the angle b/w them is 90 degrees. The same with (-1,0) and (0,1). here the semi-...
- by California4jx
Sun Jul 05, 2009 5:09 am- Forum: Problem Solving
- Topic: GMATPrep: value of point s
- Replies: 6
- Views: 1675
When you use the weighted average method you must weight by time instead of by distance. Therefore, the correct weighted average formula is as follows: 30mph*(1.0hrs/1.5hrs) + 60mph*(0.5hrs/1.5hrs) = X Solving for x, 30mph*(2/3hrs) + 60mph*(1/3hrs) = 20mph + 20mph = 40mph Therefore, the correct ans...
- by California4jx
Sun Jul 05, 2009 4:59 am- Forum: Problem Solving
- Topic: GMATPrep: average speed
- Replies: 7
- Views: 2144
From the question stem: M-J = 2(M-K) Simplifying this: M + J - 2K = 0 M+J = 2K What we need to find is : (M+J+K)/3 Substituting (M+J) in the average above we get: (2K + K)/3 = K So if we know K we can say what is the average of the salaries. 1. Insufficient 2. Sufficient, since we are given kate's ...
- by California4jx
Sun Jul 05, 2009 4:57 am- Forum: Data Sufficiency
- Topic: GMATPrep: Mary Jim Kate average annual salary
- Replies: 16
- Views: 7983
thanks !kaulnikhil wrote:M-j = 2(M-K)
M-J = 2m -2K
2k = M+j
k = M+J/2
1 not sufficient
2.M+j+k/3
now from equation1 we have M+J = 2K
therefore M+J+K/3 = 2K+k/3
=k
hence sufficient ..
hope u got it ..
- by California4jx
Sun Jul 05, 2009 4:56 am- Forum: Data Sufficiency
- Topic: GMATPrep: Mary Jim Kate average annual salary
- Replies: 16
- Views: 7983
Can anyone please discuss this from weighted average perspective?
I totally understand total distance / total time formula for total averages. What's wrong applying weighted average here though?
- by California4jx
Sat Jul 04, 2009 12:04 pm- Forum: Problem Solving
- Topic: GMATPrep: average speed
- Replies: 7
- Views: 2144
I answered C as well. But its B. Can't understand how ?
Also, abhinav85 - pls provide ur solutions, which are more valuable than just the answers, which a poster already know in most of the cases.
Thanks.
- by California4jx
Sat Jul 04, 2009 11:59 am- Forum: Data Sufficiency
- Topic: GMATPrep: Mary Jim Kate average annual salary
- Replies: 16
- Views: 7983
- by California4jx
Sat Jul 04, 2009 11:56 am- Forum: Problem Solving
- Topic: GMATPrep: value of point s
- Replies: 6
- Views: 1675
I've recently been given this solution: t/s*(-1/root(3)) = -1 ---> since lines OP and OQ are perpendicular also let s^2+t^2=r^2=3+1=4 ---> (since P lies on the same circle and O is origin) solve for s s^2+ 3s^2 =4 => s=+/-1 how did u replace t^2 with 3s^2 ? Can u expand more on your first solution,...
- by California4jx
Sat Jul 04, 2009 11:56 am- Forum: Problem Solving
- Topic: GMATPrep: value of point s
- Replies: 6
- Views: 1675
understand. My issue is to understand from weighted average perspective? - what am i doing wrong in weighted average ?
1/2(30) + 1/2(60) = 45
- by California4jx
Sat Jul 04, 2009 11:46 am- Forum: Problem Solving
- Topic: GMATPrep: average speed
- Replies: 7
- Views: 2144
GMATPrep: average speed
Finding an answer of the following question is easy. I need help to understand why are we not getting the right answer if we do it by weighted average. Pls explain how u solved preferably through weighted average. OA to follow. QUESTION: Susan drove at an average speed of 30 miles per hour for the f...
- by California4jx
Sat Jul 04, 2009 11:19 am- Forum: Problem Solving
- Topic: GMATPrep: average speed
- Replies: 7
- Views: 2144
GMATPrep: value of point s
Seems like my assumption about the right angle at the center 0 was wrong. If not, how else are we going to find the value of point s - given the seemingly obvious answer -- D -- is wrong. Question: http://img200.imageshack.us/img200/5158/85685850.jpg In the figure ahove, points P and Q lie on the ci...
- by California4jx
Sat Jul 04, 2009 11:09 am- Forum: Problem Solving
- Topic: GMATPrep: value of point s
- Replies: 6
- Views: 1675
GMATPrep: Mary Jim Kate average annual salary
In a certain year, the difference between Mary's and Jim's annual salaries was twice the difference between Mary's and Kate's annual salaries. If Mary's annual salary was the highest of the 3 people, what was the average (arithmetic mean) annual salary of the 3 people that year7 (1) Jim's annual sal...
- by California4jx
Sat Jul 04, 2009 10:49 am- Forum: Data Sufficiency
- Topic: GMATPrep: Mary Jim Kate average annual salary
- Replies: 16
- Views: 7983