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When we're asked what assertion is supported, we're really asked what MUST be true, i.e. what's inferable. If the 2 lemonade stands reported identical revenues and identical profits, we can infer 2 things: 1. the costs must have been identical , since Profit = Revenue - Costs . 2. Since revenue (sim...
- by ceilidh.erickson
Fri Apr 26, 2019 11:29 am- Forum: Critical Reasoning
- Topic: On Monday, Daisy’s Lemonade Stand sold lemonade at 20 cent
- Replies: 1
- Views: 697
First, infer everything we can from the given information: \(w, x\) and \(y\) are positive integers such that \(w \leq x \leq y\) the average (arithmetic mean) of \(w, x\) and \(y\) is \(20\) Infer --> the sum of w, x, and y is 60. Question: is \(w > 15\)? Since we know that the sum is 60 and w is t...
- by ceilidh.erickson
Fri Apr 26, 2019 11:18 am- Forum: Data Sufficiency
- Topic: \(w, x\) and \(y\) are positive integers such that
- Replies: 1
- Views: 414
This question - like many others from Veritas Prep - directly plagiarizes an Official Guide question: CR # 87, OG 13/2015: In the United States, of the people who moved from one state to another when they retired, the percentage who retired to Florida has decreased by three percentage points over th...
- by ceilidh.erickson
Fri Apr 26, 2019 11:02 am- Forum: Critical Reasoning
- Topic: In the United States, of the young adults who move from one
- Replies: 2
- Views: 626
If 10 issues cost $24, that represents an individual cost of $2.40 each.
If $2.40 is 20% less than the cover price x, then:
$$2.40=\left(0.8\right)x$$
$$2.40=\left(\frac{4}{5}\right)x$$
$$2.40\left(\frac{5}{4}\right)=x$$
$$0.60\left(5\right)=x$$
$$3.00=x$$
The answer is E.
- by ceilidh.erickson
Sat Apr 13, 2019 4:54 pm- Forum: Problem Solving
- Topic: If a subscription for 10 issues of a magazine costs $24.00
- Replies: 1
- Views: 450
To count the number of possible crews, we must calculate 2 things: 1. the number of ways to select 1 person with experience out of 12 2. the number of ways to select the remaining 2 people out of the remaining 9 Remember that when counting combinations in a diminishing pool in which order doesn't ma...
- by ceilidh.erickson
Sat Apr 13, 2019 4:42 pm- Forum: Problem Solving
- Topic: From a group of 21 astronauts that includes 12 people with
- Replies: 1
- Views: 447
For more on how the GMAT subverts our expectations of the 2 equations / 2 variables rule, see:
https://www.manhattanprep.com/gmat/blog ... ons-rules/
- by ceilidh.erickson
Sat Apr 13, 2019 4:34 pm- Forum: Data Sufficiency
- Topic: What is the value of xy?
- Replies: 2
- Views: 578
Question: What is the value of xy? To answer this question, we need either values for x and y individually, or simply a value for the product xy. (1) y = x + 1 This gives us y in terms of x, but cannot give us the value of xy. Insufficient. (2) y = x^2 + 1 This gives us y in terms of x^2, but canno...
- by ceilidh.erickson
Sat Apr 13, 2019 4:22 pm- Forum: Data Sufficiency
- Topic: What is the value of xy?
- Replies: 2
- Views: 578
Remainder problems in DS often require TESTING CASES: If the positive integer n is greater than 6, what is the remainder when n is divided by 6? We don't have much given information to unpack here, so let's move on to the statements: 1) When n is divided by 9, the remainder is 2. Translate: n = (som...
- by ceilidh.erickson
Sat Apr 13, 2019 11:50 am- Forum: Data Sufficiency
- Topic: If the positive integer \(n\) is greater than \(6\), what is
- Replies: 1
- Views: 383
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Probability is always defined this way: probability = (# of desired outcomes)/(total possible # of outcomes) You correctly identified that there was only one pairing of terms that would give you a difference of squares: (x + y) and (x - y). However, you miscounted your total # of possible outcomes. ...
- by ceilidh.erickson
Thu Apr 04, 2019 11:25 am- Forum: GMAT Math
- Topic: GMAT Prep Practice Test Quant Questions #3
- Replies: 5
- Views: 10297
In DS, the GMAT often likes to mix up PROPORTIONS v. REAL NUMBERS. Generally speaking, a real number won't help to answer a proportion question (unless you're give more info). Here are more in a similar vein to try: https://www.beatthegmat.com/by-what-percent-was-the-price-of-a-certain-television-se...
- by ceilidh.erickson
Thu Apr 04, 2019 10:42 am- Forum: GMAT Math
- Topic: GMAT Prep Practice Test Quant Questions #2
- Replies: 2
- Views: 3098
We can TEST CASES to prove insufficiency in this problem. Warehouse W’s revenue from the sale of sofas was what percent greater this year than it was last year? Revenue from sales will equal (price of sofas)(quantity sold) --> R = (p)(q) To answer the question of the proportional difference in rev...
- by ceilidh.erickson
Thu Apr 04, 2019 10:23 am- Forum: GMAT Math
- Topic: GMAT Prep Practice Test Quant Questions #2
- Replies: 2
- Views: 3098
Since negative exponents indicate the reciprocal of base to the positive exponent, we can rewrite our exponents and bases: $$\left(\frac{1}{5}\right)^M=5^{-M}$$ $$\left(\frac{1}{4}\right)^{18}=4^{-18}=2^{-36}$$ $$\frac{1}{\left(2\right)\left(10\right)^{35}}=(2^{-1})(10^{-35})=(2^{-1})((5\cdot2)^{-35...
- by ceilidh.erickson
Thu Apr 04, 2019 10:11 am- Forum: GMAT Math
- Topic: GMAT Prep Practice Test Quant Questions
- Replies: 1
- Views: 2824
If the train traveled for 25 hrs at 50 mph, it traveled a total of 1250 miles: (Rate)(Time) = Distance. Let's calculate the distance of each of the answer choices to town W. A. T --> V --> W = 600 + 750 = 1350 B. U --> V --> W = 500 + 750 = 1250 C. V --> W = 750 D. Y --> X --> W = 675 + 125 = 800 E....
- by ceilidh.erickson
Thu Apr 04, 2019 9:56 am- Forum: Problem Solving
- Topic: The figure shows seven train stations and the distances, in
- Replies: 3
- Views: 578
Overlapping Sets are a common question type on the GMAT, and the double-set matrix is often the easiest way to solve. For more on how to use the matrix, see: https://www.beatthegmat.com/of-the-800-sweaters-in-a-certain-store-150-are-red-how-t306943.html#828510 https://www.beatthegmat.com/at-a-charit...
- by ceilidh.erickson
Thu Apr 04, 2019 9:53 am- Forum: Data Sufficiency
- Topic: At a certain company, some of the employees have advanced
- Replies: 2
- Views: 501
This is an OVERLAPPING SETS question. The easiest way to solve is by using a DOUBLE SET MATRIX: https://i.postimg.cc/1gW91b8Y/Screenshot-2019-04-04-13-42-19.png We can fill in what we know from the question stem: If 20 percent of all employees have one year or more of experience and no advanced degr...
- by ceilidh.erickson
Thu Apr 04, 2019 9:50 am- Forum: Data Sufficiency
- Topic: At a certain company, some of the employees have advanced
- Replies: 2
- Views: 501