Search found 82 matches
Let's start with this sentence: Tracking satellites (is/are) important for the satellite agency. Here, tracking is acting a gerund -- a verb form that acts as a noun. What is the thing that's important? Tracking. For that reason, the singular verb is is required. Now, the word satellite is acting as...
- by rey.fernandez
Wed Sep 09, 2009 2:56 pm- Forum: Sentence Correction
- Topic: OG 10th Edition Q 140
- Replies: 14
- Views: 8209
supershick, you'll notice that the question does not specifically ask for values for a and b. It asks for the two points through which the graph crosses the x-axis. The information given (in both statements together) is enough to answer the question: (2, 0) and (-3,0). It doesn't matter which value ...
- by rey.fernandez
Fri Oct 17, 2008 10:38 pm- Forum: Data Sufficiency
- Topic: Another GMAT prep PS questn
- Replies: 16
- Views: 8312
I'll get you going on this one... you should see if you can work out the rest of it on your own. The question is asking us to identify which function from among the five given has the property that f(x) = f(1 - x). That is, "plugging in" x into f yields the same result as plugging in 1 - x...
- by rey.fernandez
Sat Aug 09, 2008 9:40 pm- Forum: Problem Solving
- Topic: Wierd Problem
- Replies: 2
- Views: 1368
It's usually helpful with these problems to determine the rate of each machine. All six machines take 12 days to do this job. If it were just one machine working at the job, it would take six times as long to finish the job, or 72 days. If the job is to be completed in 8 days, then 72/8 = 9 machines...
- by rey.fernandez
Sat Aug 09, 2008 9:28 pm- Forum: Problem Solving
- Topic: Work Problem
- Replies: 4
- Views: 1673
I agree with sudhir, but would just add a couple more brackets to make it clear how the powers are working in the numerator:
2^[(4-1)^2] / 2^(3-2)
2^(3^2) / 2^(3-2)
2^9 / 2^1
2^8
- by rey.fernandez
Sat Aug 09, 2008 9:10 pm- Forum: Problem Solving
- Topic: Real Easy Question
- Replies: 3
- Views: 1195
In my edition, the question stem reads:
If x is an integer, is x|x| < 2^x?
Check your text again...
With this question, (1) is sufficient because the left side of the inequality is negative while the right side is positive.
- by rey.fernandez
Sun Aug 03, 2008 1:29 am- Forum: Data Sufficiency
- Topic: OG- DS #128
- Replies: 4
- Views: 1840
(1) The total value of the $0.15 stamps must be a dollar amount that ends in 5 or 0 (in the units cents position). In order for the total value of both stamps to equal $4.40, therefore, the total value of the $0.29 stamps must also be a dollar amount that ends in 5 or 0. That would only occur if a m...
- by rey.fernandez
Sun Aug 03, 2008 1:17 am- Forum: Data Sufficiency
- Topic: Word Translation: Joanna bought only $0.15 stamps and ....
- Replies: 22
- Views: 19546
- by rey.fernandez
Sun Aug 03, 2008 1:02 am- Forum: Data Sufficiency
- Topic: percentage question
- Replies: 1
- Views: 1447
If ab not equal to 0, and points (-a, b) and (-b,a) are in the same quadrant of the xy plane, is point (-x, y) in this same quadrant? (1) XY >O (2) AX > O The question stem: The only way for (-a, b) and (-b, a) to be in the same quadrant, a and b must have the same sign. In the case that a>0 and b>...
- by rey.fernandez
Sun Aug 03, 2008 12:55 am- Forum: Data Sufficiency
- Topic: DS problem
- Replies: 1
- Views: 3416
I find the formula for the area of an equilateral triangle is a good one to memorize. If the length of the side of an equilateral triangle is s, its area is s^2root(3)/4. For this problem, let's call the smaller triangle's side s. Therefore, the larger triangle's side is 2s. It follows that: A(small...
- by rey.fernandez
Sun Aug 03, 2008 12:18 am- Forum: Problem Solving
- Topic: Geometry
- Replies: 6
- Views: 1625
newera's solution is great -- nice way to reason your way through without too much hassle. Here's an algebraic approach: let x be the fraction of each bottle's capacity that is to be filled. So, 2x + 4x = 4 6x = 4 x = 2/3 So each bottle should be filled to 2/3 of its capacity. The 4-cup bottle will ...
- by rey.fernandez
Sun Aug 03, 2008 12:09 am- Forum: Problem Solving
- Topic: Fractions
- Replies: 3
- Views: 1949
As this is a MG problem, I can confirm how the actual problem should read: If 4^(4x) = 1600, what is the value of [4^(x-1)]^2? Let's start with the question: [4^(x-1)]^2 is equivalent to 4^[2(x-1)] or 4^(2x-2). Remember that (a^b)^c = a^(bc). In other words, when you raise a power to a power, you ca...
- by rey.fernandez
Sun Aug 03, 2008 12:03 am- Forum: Problem Solving
- Topic: MGMAT
- Replies: 14
- Views: 2016
You're right that either meaning could be the intended one. But the main point is that if the original sentence proposes one meaning, you should eliminate all answer choices that change that original meaning by moving the adverbial modifier to another location. The only time to veer off from the ori...
- by rey.fernandez
Sat Aug 02, 2008 11:34 pm- Forum: Sentence Correction
- Topic: Why is the sentence wrong - Semantically or Grammatically
- Replies: 3
- Views: 5932
Eliminate options B and E due to subject-verb agreement. The subject "skull" requires "has been found." Eliminate A due to the awkward and wordy "in addition." Eliminate D because it is a sentence fragment -- the subject "skull" has no corresponding verb in th...
- by rey.fernandez
Sat Aug 02, 2008 11:18 pm- Forum: Sentence Correction
- Topic: Homo
- Replies: 11
- Views: 2431
Pick C. It can be reasonably concluded that among the inconclusive examinees, some are truthful and some are untruthful. If employers refuse to hire all of them, then that's an unfair practice to the subset of examinees who are truthful.
- by rey.fernandez
Wed Jul 16, 2008 9:46 pm- Forum: Critical Reasoning
- Topic: Polygraph Test
- Replies: 4
- Views: 5874