Search found 65 matches


there are two solutions, one is one the negative side of the number line

by erdnah

Mon Aug 27, 2007 10:00 pm
Forum: Data Sufficiency
Topic: GMATPrep - Number line
Replies: 1
Views: 1407

i think everything between the thrid root of 2 and 1 satisfies II.
but a real explanation would be nice; don't know it...

by erdnah

Mon Aug 27, 2007 12:44 pm
Forum: Problem Solving
Topic: Number properties - another question
Replies: 2
Views: 1337

i think you're losing many points with the last questions you've to guess. before starding quant for example, i write down the following on my scrap paper (thanks to mgmat): 60 - 8 45 - 15 30 - 23 15 - 31 this means, if i've 60 minutes left, i should be on question 8 or fast. if i've 45 minutes left...

by erdnah

Mon Aug 27, 2007 12:19 pm
Forum: GMAT Strategy
Topic: Need help - Demoralized!
Replies: 14
Views: 3322
by erdnah

Mon Aug 27, 2007 11:58 am
Forum: Data Sufficiency
Topic: GMAT Prep: Geometry
Replies: 5
Views: 2199

GMAT Prep: Geometry

If a and b are both positive numbers, what are the coordinates of the midpoint of the line segment CD in the xy-plane?

(1) The coordinates of C are (a, 1-b).
(2) The coordinates of D are (1-a, b).

by erdnah

Mon Aug 27, 2007 11:04 am
Forum: Data Sufficiency
Topic: GMAT Prep: Geometry
Replies: 5
Views: 2199

@givemeanid: plugging in - great approach :)

by erdnah

Mon Aug 27, 2007 10:51 am
Forum: Data Sufficiency
Topic: Gmat Prep - number properties
Replies: 5
Views: 2030

(1) x-y=0.5 if x is positive and greater 0.5, y has to be positive too if x is positive and 0.5, y has to be zero if x is positive but less 0.5, y has to be negative if x is zero or less, y has to be negative NOT sufficient (2) x/y>1 either x and y are both positive or negative NOT sufficient (1) an...

by erdnah

Mon Aug 27, 2007 10:43 am
Forum: Data Sufficiency
Topic: Gmat Prep - number properties
Replies: 5
Views: 2030

kevincanspain wrote:Nice! You might as well use the quadratic formula.
what formula do you mean?

by erdnah

Sun Aug 26, 2007 11:33 am
Forum: Problem Solving
Topic: How to factor a quadriatic?
Replies: 6
Views: 1877
by erdnah

Fri Aug 24, 2007 11:45 pm
Forum: Problem Solving
Topic: GMAT Prep - No Properties
Replies: 1
Views: 1399
by erdnah

Fri Aug 24, 2007 6:06 am
Forum: I just Beat The GMAT!
Topic: 680. Gotta take it again.
Replies: 12
Views: 7010

2^s = 2^u + 2^v
s = u + v

I. no
II. no
III. yes, s = v - u, and u is a positive integer and so cannot be 0!

D

by erdnah

Fri Aug 24, 2007 1:17 am
Forum: Problem Solving
Topic: sum of unknown power
Replies: 5
Views: 1504

2x-3y < -6

if x is positive and y is negative, there is no chance for fulfill the inequality (lowest result in this case is near -1). so +x-y quadrant can't contain such a point (E)

by erdnah

Fri Aug 24, 2007 1:14 am
Forum: Problem Solving
Topic: E
Replies: 5
Views: 1908

hours walking day 1: 18 = d + d + 2 = 8
hours walking day 2: 10

average speed:
8x + 10(x+1) = 64
8x + 10x + 10 = 64
18x = 54
x = 3

B

by erdnah

Fri Aug 24, 2007 1:06 am
Forum: Problem Solving
Topic: B
Replies: 1
Views: 1491

1) not suff
2) not suff
= a, b, d eliminated

r=s=t=1 => rst = 1
r= 1/3, s = 3, t = 1/3 => rst = 1/3

so: e

by erdnah

Fri Aug 24, 2007 12:48 am
Forum: Data Sufficiency
Topic: WHy not C?
Replies: 1
Views: 1303