Search found 112 matches
Machines OG
Machine A produces bolts at a uniform rate of 120 every 40 seconds, and Machine B produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce a total of 200 bolts? Answer: By calculation, we find out that Machine...
- by Thouraya
Sun Sep 18, 2011 12:10 am- Forum: Problem Solving
- Topic: Machines OG
- Replies: 8
- Views: 2912
sum of consecutive integers
Expert help appreciated: (not sure what the OA is)
Is the sum of a series of n consecutive integers even?
(1) n=6
(2) The n digit number formed by the seriest is a multiple of nine
- by Thouraya
Sat Sep 17, 2011 4:20 am- Forum: Data Sufficiency
- Topic: sum of consecutive integers
- Replies: 2
- Views: 1000
Probability
A jar contains 3 red marbles and 2 blue marbles. If two marbles are selected at the same time, what is the probability that both marbles will be red?
How can I solve the above with the approach 1-Probability of None?
Thanks
- by Thouraya
Sat Sep 17, 2011 12:51 am- Forum: Problem Solving
- Topic: Probability
- Replies: 2
- Views: 977
@GMATGuruNY,
What if I want to solve the marbles problem with the approach 1-Probability None?
PS: i can't solve the Joshua/Jose problem with this approach because we have more than two choices?
Thank you so much
- by Thouraya
Sat Sep 17, 2011 12:49 am- Forum: Problem Solving
- Topic: Joshua and Jose
- Replies: 14
- Views: 2676
- by Thouraya
Fri Sep 16, 2011 5:07 am- Forum: Problem Solving
- Topic: Please help Gmat prep 2 PS: a certain car averages..
- Replies: 11
- Views: 6566
- by Thouraya
Thu Sep 15, 2011 10:46 pm- Forum: Data Sufficiency
- Topic: Sum of consecutive integers
- Replies: 7
- Views: 1112
Hi Guys, I am still stuck on this problem. Is it 700-Level ? I am not quite sure how it differs from the regular work/rate problems (in that they don't mention how much each machine can perform on its own? so I can consider that they are approaching the problem the other way around?). Would apprecia...
- by Thouraya
Thu Sep 15, 2011 10:30 pm- Forum: Problem Solving
- Topic: Six machines each working at same constant rate together can
- Replies: 23
- Views: 18198
Hi @GMATguruNY,
I am still finding it challenging to determine when we would have only ONE combination of x and y that sum up to a specific total, vs when we could have more than 1 combination of values for x and y that would sum up to a certain total. Is there any way I could know? Thanks so much
- by Thouraya
Thu Sep 08, 2011 11:57 pm- Forum: Data Sufficiency
- Topic: gmat prep question
- Replies: 18
- Views: 8176
Hi,
I don't understand this problem; is it considered a difficult one or might come across it in a 650 level?
Why can't we deal with it as a regular rate/work problem? Then in 1 hour, Jack can do 1/20 and Tom 1/25..I don't know how to proceed though. I would grealy appreciate any help
- by Thouraya
Thu Sep 08, 2011 4:08 am- Forum: Problem Solving
- Topic: Need help
- Replies: 10
- Views: 2628
Improving on the Verbal
Dear @gmatguruNY, Your tips and tricks are exceptional, so I was wondering if you have any advice to offer on how to improve on the verbal section. I usually score in the high 60's percentile, but would love to score higher to help my overall grade. I would like to improve on the SC and CR; the RC I...
- by Thouraya
Wed Sep 07, 2011 11:13 pm- Forum: GMAT Verbal & Essays
- Topic: Improving on the Verbal
- Replies: 0
- Views: 1307
- by Thouraya
Mon Jul 04, 2011 10:57 pm- Forum: I just Beat The GMAT!
- Topic: How to Calculate Score
- Replies: 3
- Views: 1756
How to Calculate Score
Hi,
If I got a 72% on Math (45), what percent shall I get on English so that I score 650 overall?
Thanks!
- by Thouraya
Mon Jul 04, 2011 10:26 pm- Forum: I just Beat The GMAT!
- Topic: How to Calculate Score
- Replies: 3
- Views: 1756
Hi @Stuart,
We have these expressions: x+y,x+5y,x-y and 5x-y
Why can't we choose either (x+y) and (x-y) OR (x+5y) and (x-y)? Why is the second option wrong to consider? Thank you!
- by Thouraya
Wed Jun 29, 2011 1:08 am- Forum: Problem Solving
- Topic: GMAT expressions
- Replies: 9
- Views: 6646
Sentence Correction
Hi, I have a few questions regarding sentence correction rules, and would appreciate an expert's help: 1) when do we use due to? vs. when do we use because? 2)when do we use "using"? vs. when do we use "based on"? 3) How come it is correct to say: "..like the planets, the st...
- by Thouraya
Sun Jun 19, 2011 11:33 am- Forum: Sentence Correction
- Topic: Sentence Correction
- Replies: 2
- Views: 1036
- by Thouraya
Tue May 31, 2011 8:17 am- Forum: Problem Solving
- Topic: A certain business produced x rakes each month form November
- Replies: 9
- Views: 8773