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This is an inspiring and well-informed read. Thanks for the story. I'll be sharing it with my students.

by Erfun_GMATCompass

Wed Mar 01, 2017 11:36 am
Forum: I just Beat The GMAT!
Topic: 610->690->740-8 months of rollercoaster ride ENDS!
Replies: 33
Views: 28670

It's worth noting that this passage comes from a prior SAT, so its actual applicability to the GMAT will be limited, both in terms of the difficulty of the passage's content and the types of questions you'll encounter. If you're looking for GMAT-level passages outside of the OG, I'd recommend lookin...

by Erfun_GMATCompass

Wed May 04, 2011 10:09 am
Forum: Reading Comprehension
Topic: RC 99 passage 39
Replies: 25
Views: 12961

Congratulations, Huang! It's funny, but I just recently discovered this posting after another student notified me. I'm very happy to see it, though. You worked your butt off and 100% deserve the score you got. For those of you struggling on Sentence Correction, I think you should be encouraged to kn...

by Erfun_GMATCompass

Sun Oct 24, 2010 2:02 pm
Forum: I just Beat The GMAT!
Topic: DONE with the GMAT! - 710 (Q 49, V 37)
Replies: 5
Views: 7879

Statement 1 doesn't provide enough information. If x = -4 and y = -3, 3x = 4y, and the answer is No. On the other hand, if x = - 1,000,000 and y = 1,000,000, the answer is Yes. Insufficient. (Notice that I chose extremes when plugging in numbers here. When plugging in questions, you want to invalida...

by Erfun_GMATCompass

Tue Jul 20, 2010 11:16 am
Forum: Data Sufficiency
Topic: manhattan problem
Replies: 4
Views: 1017

Great write-up! Congrats on the score! Waging War on the GMAT Test Date: March 26th, 2009 Final Score: Q50 (94%), V42 (95%), AWA 6.0, Overall: 760 (99th percentile) "If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, fo...

by Erfun_GMATCompass

Thu Jun 24, 2010 9:49 am
Forum: I just Beat The GMAT!
Topic: Waging War on the GMAT (760 - 99th percentile)
Replies: 55
Views: 124310

An important point to take away from Stacey's great explanation is that a relative pronoun (such as "who" and "which") does not ALWAYS have to modify the noun immediately preceding it. If there's a noun + prepositional phrase + relative clause, the relative clause could modify either the original no...

by Erfun_GMATCompass

Mon Jun 21, 2010 4:35 pm
Forum: Sentence Correction
Topic: Ambiguous Appositive
Replies: 14
Views: 1753

An important point to take away from Stacey's great explanation is that a relative pronoun (such as "who" and "which") does not ALWAYS have to modify the noun immediately preceding it. If there's a noun + prepositional phrase + relative clause, the relative clause could modify either the original no...

by Erfun_GMATCompass

Mon Jun 21, 2010 4:28 pm
Forum: Sentence Correction
Topic: Ambiguous Appositive
Replies: 14
Views: 1753

The word "this" is a demonstrative pronoun. It must ALWAYS be followed by a concrete noun. If there's no noun after THIS, you can immediately eliminate the choice. 15. Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used as a secret languag...

by Erfun_GMATCompass

Mon Jun 21, 2010 2:12 pm
Forum: Sentence Correction
Topic: 800 bob
Replies: 11
Views: 4265

When trying to determine the sum of a set of evenly spaced integers, the key formula to keep in mind is: Average of items in the set * Number of items in the set = Sum of all the items in the set. To figure out the average of a set of evenly-spaced integers, add up the first and last integer and div...

by Erfun_GMATCompass

Mon Jun 21, 2010 12:02 pm
Forum: Problem Solving
Topic: OG PS #157
Replies: 9
Views: 2234

There is, however, one exception to this rule. If you're looking for a value that, by definition, could only be positive, and the quadratic equation is such that it yields one positive and negative solution, it will still be sufficient. For example, if you're looking for the side of a rectangle, x ,...

by Erfun_GMATCompass

Sun Jun 20, 2010 5:55 pm
Forum: Data Sufficiency
Topic: Value of X? Data Sufficiency
Replies: 4
Views: 1447

The author concludes that the tranquilizer inhibits fertility. His evidence is that female rhinoceroses that have been recollared and thus tranquilized are infertile while uncollared females are fertile. For the author's conclusion to be valid, we have to assume that uncollared females haven't been ...

by Erfun_GMATCompass

Sun Jun 20, 2010 5:39 pm
Forum: Critical Reasoning
Topic: 750 level GMAT prep CR Question
Replies: 6
Views: 3903

It's illogical to say "recently extended slump" since this would imply that the slump was extended by someone/something. Though it's somewhat of a subtle error in meaning, we could assume that the business would be working in its best interest and would not intentionally extend the slump it's experi...

by Erfun_GMATCompass

Sun Jun 20, 2010 4:01 pm
Forum: Sentence Correction
Topic: One of its many problems...
Replies: 10
Views: 2301

Step 1: You see "its" for choices A, B, and C and "their" for choices D and E. Since the difference is between a plural and singular pronoun, identify what noun "its" refers to. The antecedent is "retailer," which is singular. Thus, D and E are eliminated. A, B, and C all differ in verb tense. A use...

by Erfun_GMATCompass

Sun Jun 20, 2010 3:50 pm
Forum: Sentence Correction
Topic: One of its many problems...
Replies: 10
Views: 2301

When you see an underlined pronoun, your first step is always to identify the noun it refers to. In this sentence, the antecedent for it is "the term" not "psychopath." "Psychopath" in this sentence does not refer to an actual person, but rather to the name that we use to describe a person. Thus, A,...

by Erfun_GMATCompass

Sun Jun 20, 2010 3:41 pm
Forum: Sentence Correction
Topic: It is some ones who is!
Replies: 2
Views: 1178

Interesting question. You use a comma before "and" when you're joining two new clauses. For example, "I love the GMAT, and I study for it every day." On the other hand, if you're using "and" to join two verbs, both of which are done by the subject, you don't use a comma before the "and." For example...

by Erfun_GMATCompass

Thu Jun 17, 2010 2:45 pm
Forum: Sentence Correction
Topic: Placement of Conjunction
Replies: 19
Views: 6591