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If x = u^2 – v^2 and y = 2uv

If x = u^2 – v^2, y = 2uv, and z = u^2 + v^2 , and if x = 11, what is the value of z (1) y = 60 (2) u = 6 statement (2) is easier- sufficient For statement (1), I expressed (u^2 – v^2) as a difference of two squares => (u+v)(u-v) Recognizing that u^2 – v^2 can be expressed as a difference of t...

by gmatdriller

Thu Sep 24, 2015 3:40 pm
Forum: Data Sufficiency
Topic: If x = u^2 – v^2 and y = 2uv
Replies: 5
Views: 4948

Though the correct response here is D. What happens if D where framed as shown below: ...university students boycotted classes in a one-day strike to protest a law that requires them to contribute $330 a… year, instead of the $7 per year required previously toward the cost of higher education This...

by gmatdriller

Sun Sep 13, 2015 5:16 am
Forum: Sentence Correction
Topic: Most of Portugal’s 250,000 university students
Replies: 10
Views: 4091

Thanks GmatGuru. Analyzing B & D: Generally, there is a decline in eggs and the result might threaten the shorebitd population. Cause: Decline in crab eggs; Effect: Threat to the shorebird population. B: States the cause of the "Cause & Effect" relationship i.e why the decline occurred. Doesn't effe...


During the month of May, crabs arrive in Delware’s beaches

During the month of May, crabs arrive in Delware’s beaches to lay eggs. Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds. Delware’s crab population has declined recently. This decline, however, poses no serious threat to the...


What is the difference if the question had asked: In how many ways can 4 children be assigned 16 different gifts...? Assume a child can receive as few as 0 gifts and as many as 16. Thanks Same problem. Since it is possible for a child not to receive a gift, but each gift MUST be given to a child, w...

by gmatdriller

Thu Sep 10, 2015 11:46 am
Forum: Problem Solving
Topic: combo
Replies: 14
Views: 3493

What is the difference if the question had asked:

In how many ways can 4 children be assigned 16 different gifts...?
Assume a child can receive as few as 0 gifts and as many as 16.

Thanks

by gmatdriller

Thu Sep 10, 2015 5:02 am
Forum: Problem Solving
Topic: combo
Replies: 14
Views: 3493

I'll opt for A in this case; "his life uprooted by..." is a modifier with no active verb B: The defense lawyer AND witness portrayed..., AND his life uprooted X, and Y: active Vs passive; Also, "and his life" cannot refer to "Defense Lawyer and witness" C: Independent clause, AND Dependent clause; u...

by gmatdriller

Thu Sep 10, 2015 3:27 am
Forum: Sentence Correction
Topic: Use of colon
Replies: 1
Views: 978

I'll prefer A here.
Declined other options using "with" bcos it's supposed to function as a PREP - no active verbs

Expert Opinions pls.

by gmatdriller

Thu Sep 10, 2015 1:20 am
Forum: Sentence Correction
Topic: SC : Tough one
Replies: 2
Views: 1108

C: Option C reflects the shrinking of resources(soldiers) in favor of advanced weaponry: 40 reduced to only 2; larger ones reduced to only a few. E: The passage only mentioned "positions" - not "strategic positions or "strategic weapons" Also, E does not highlight the drastic reduction of resources ...

by gmatdriller

Thu Sep 10, 2015 1:10 am
Forum: Critical Reasoning
Topic: BTG practice questions: military
Replies: 18
Views: 10517

SD on the gmat would not require such an intensive calculation. You can visualize the SD of a set of data points. If A = 2,2,2 and B = 1,1,3 Mean of A = 2; Mean of B = 1.67 You would agree that the elements in A are closely packed towards the mean(2) than are the elements in set B towards 1.67... So...

by gmatdriller

Wed Sep 09, 2015 12:32 am
Forum: Data Sufficiency
Topic: Standard deviation
Replies: 24
Views: 14898

4 = 2 x 2 (factors of 4 = 1, 2, & 4)...only 1 prime factor(2) 9 = 3 x 3 (factors of 9 = 1, 3, & 9)...only 1 prime factor(3) 16 = 4 x 4(factors of 16 = 1,2,4,8,& 16)...only 1 prime factor(2) 25 = 5 x 5 (factors of 25 = 1,5, & 25)....only 1 prime factor(5) 36 = 4 x 9 (factors of 36= 1,2,3,4,6,8,12,18,...

by gmatdriller

Tue Sep 08, 2015 11:18 pm
Forum: Data Sufficiency
Topic: Number properties - prime factors
Replies: 27
Views: 13006

Hi sandipgumtya, When it comes to probability questions, there are only two things that you can calculate: what you WANT to have happen and what you DON'T want to have happen. Since the probability of what you WANT + the probability of what you DON'T WANT will always add up to the number 1, in cert...

by gmatdriller

Tue Sep 08, 2015 10:49 pm
Forum: Problem Solving
Topic: Statistics
Replies: 12
Views: 4005

INORGANIC FRUITS: Pesticides remain for days - be careful ORGANIC FRUITS: Pesticides disappear within a few hours- feel free to consume So, why would the argument recommend only organic fruits? I think the advice is based on the relative periods within which the pesticides remain on the fruits - tha...

by gmatdriller

Tue Sep 08, 2015 4:40 pm
Forum: Critical Reasoning
Topic: Inorganic pesticides remain active
Replies: 8
Views: 1776

The lesson here is that conclusion is KING.

Meanwhile, would A be a valid choice for ASSUMPTION / INFERENCE?

Thanks for your feedback

by gmatdriller

Tue Sep 08, 2015 3:58 pm
Forum: Critical Reasoning
Topic: Two types of earthworm - Veritas
Replies: 15
Views: 4090

Since both A and B started at the same time, they both spent same time, t. Let d be the extra distance B traveled beyond 30m. Time spent by Ashok = Time spent by Brian Time spent by Ashok = distance traveled / speed = Let Speed of Ashok = a meters; distance = 30 + d Time spent by Ashok = (30+d)/a......

by gmatdriller

Fri Sep 04, 2015 4:10 am
Forum: Problem Solving
Topic: Speed Time Distance MGMAT
Replies: 5
Views: 1205