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Hi man,
Work problems --> ratios

One machine takes X hours to finishh the task and the other one takes 3/4*X to finish the same task. Together, they finish it in 6 hours so we can write:
1 / X + 1 /( (3/4)*X ) = 1/6

Solve this equation and you get X=14

by pepeprepa

Sun Feb 22, 2009 6:32 am
Forum: Problem Solving
Topic: Work/Rate/Time
Replies: 2
Views: 1424

Q: 48 Percentile: 84
V: 22 Percentile: 27
580 Percentile: 60

by pepeprepa

Sun Sep 07, 2008 8:38 am
Forum: I just Beat The GMAT!
Topic: A bitter experience - Disappointing 580
Replies: 11
Views: 2863

Yeah guys that is Q48, not Q28 :D
Thanks all of you for your messages, I take a break for the moment.

by pepeprepa

Sun Sep 07, 2008 1:59 am
Forum: I just Beat The GMAT!
Topic: A bitter experience - Disappointing 580
Replies: 11
Views: 2863

A bitter experience - Disappointing 580

The test AWA was ok. However, the Q started in the wrong way, I could not find the tricks of the question, I really never never felt it during my practices tests. I had to guess several times and I could not gain confidence with any question, I could not apply my tricks or methods. Indeed, I found ...

by pepeprepa

Fri Sep 05, 2008 10:06 am
Forum: I just Beat The GMAT!
Topic: A bitter experience - Disappointing 580
Replies: 11
Views: 2863

About "rather than", do we have to use "as" or not ?

by pepeprepa

Thu Sep 04, 2008 3:04 am
Forum: Sentence Correction
Topic: GMAT Prep - Stone Age
Replies: 10
Views: 2126

I am sorry but I still can explain myself how you go to A or D. I am ok that if you know A by itself you have 50:50 to get A or D :D but only with the set 6-18 you cannot be sure A by itself is sufficient given you can have OTHER sets with a different number of primes like those I posted (if I am ri...

by pepeprepa

Wed Sep 03, 2008 1:43 pm
Forum: Data Sufficiency
Topic: please help me
Replies: 13
Views: 2600

In this case, you cannot chose y=1 or y=-6 You can see that for y=1, y^2 is different from 36 for y=-6, y^2- 7y + 6 is different from 0 But with y=6 we have y^2 = 36 and y^2- 7y + 6 = 0 What you look is a solution which suits both statements, your solution cannot contradict with one equation but be ...

by pepeprepa

Wed Sep 03, 2008 1:36 pm
Forum: Data Sufficiency
Topic: equations
Replies: 4
Views: 2541

What does xy>0..mean?

"xy" means x and y are multiplied. If we want to totally write "a multiplied by b" which is the same as "b multiplied by a" we write: a x b or a * b. That's a multiplication.
xy>0 means that the result is positive. For example, if x=2 and y=3 we have: 2*3=6>0

by pepeprepa

Wed Sep 03, 2008 1:26 pm
Forum: Data Sufficiency
Topic: inequalities
Replies: 13
Views: 2171

I am ok for the time but it is important to look at what the question asks be it a DS or not! It is possible that two sets respect all conditions but have a different number of primes. Anyway, it's true that timing is short for this one if you do not find the spirit as we do not. I think I would hav...

by pepeprepa

Wed Sep 03, 2008 1:22 pm
Forum: Data Sufficiency
Topic: please help me
Replies: 13
Views: 2600

Is y = 6?

1. y^2 = 36
You have either y=6 or y=-6
So it is insufficient.

2. y^2- 7y + 6 = 0
We can write it like that
(y-6)(y-1)=0
So here the solutions are either y=6 or y=1
So it is insufficient.

1 and 2.
y=6 or y=-6 and y=6 or y=1
So it is 6 !
C

by pepeprepa

Wed Sep 03, 2008 1:15 pm
Forum: Data Sufficiency
Topic: equations
Replies: 4
Views: 2541

I don't follow how you state that 1) is right for example. Did I miss something in the question? 6 to 18 We have 3 multiples of 6 and 2 multiples of 5 which are also multiples of either 2 or 3. We have primes: 7,11,13,17 --> 4 primes 42 to 54 We have 3 multiples of 6 and 2 multiples of 5 which are a...

by pepeprepa

Wed Sep 03, 2008 1:00 pm
Forum: Data Sufficiency
Topic: please help me
Replies: 13
Views: 2600

I would say E but I don't see how to approach this one.

by pepeprepa

Wed Sep 03, 2008 12:47 pm
Forum: Data Sufficiency
Topic: please help me
Replies: 13
Views: 2600

There is no special way for this question.
As Bourne told there is nothing to do with statement 1 alone given there is x and nothing simplifies.
Statement 2
Result is either -8 or 11

With statement 1 and 2 you need to chose a positive one number so it's 11

by pepeprepa

Wed Sep 03, 2008 12:29 pm
Forum: Data Sufficiency
Topic: What is the best way to solve this absolute value DS problem
Replies: 3
Views: 1502

For I: if x = 4 and y = 9. Then Norman earned ($20+24 = 44) this week, and ($20+36+36 = 92). So y> 2x. However, if x = 6 and y = 11. Then Norman earned $56 in the first week, and 116 the next. In this case, $116 > 2 × $56, yet y < 2x. I still don't know how I can make sure that I choose all of the ...

by pepeprepa

Wed Sep 03, 2008 12:22 pm
Forum: Data Sufficiency
Topic: As a bicycle salesperson, Norman earns a fixed salary of ...
Replies: 6
Views: 4745

It is clear that statement one is the most complicated. y>2x must be true? Let's try to find a counter-example, if we cannot so it must be true. In your example, you want Norman to earn more than twice as much as he did last week. If we chose x=10 and y=18 we have y<2x Revenue with 10: 20 + 6*6 + 4*...

by pepeprepa

Wed Sep 03, 2008 12:19 pm
Forum: Data Sufficiency
Topic: As a bicycle salesperson, Norman earns a fixed salary of ...
Replies: 6
Views: 4745