## Search found 418 matches

##### If x = u^2 â€“ v^2 and y = 2uv

If x = u^2 â€“ 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 â€“ v^2) as a difference of two squares => (u+v)(u-v) Recognizing that u^2 â€“ 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 â€“ 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 aâ€¦ 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 Portugalâ€™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...

- by gmatdriller

Sun Sep 13, 2015 5:01 am- Forum: Critical Reasoning
- Topic: During the month of May, crabs arrive in Delwareâ€™s beaches
- Replies:
**6** - Views:
**4186**

##### During the month of May, crabs arrive in Delwareâ€™s beaches

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

- by gmatdriller

Sat Sep 12, 2015 3:32 am- Forum: Critical Reasoning
- Topic: During the month of May, crabs arrive in Delwareâ€™s beaches
- Replies:
**6** - Views:
**4186**

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**