Search found 15 matches
Finance Majors/Non-Finance Majors - Overlapping Set Question
In a given finance lecture, 30% of the students are finance majors, and 40% of the students are female. The gender distribution for finance majors and non-finance majors is the same. If one student is called on at random, what is the probability that the student is neither female nor a finance major...
- by alexander.vien
Tue Jan 29, 2013 6:05 pm- Forum: Problem Solving
- Topic: Finance Majors/Non-Finance Majors - Overlapping Set Question
- Replies: 8
- Views: 7376
That's the common denominator of all the terms. When you have a bunch of fractions on one side of an equation an easy way to simplify is to multiply both sides by the product of all the denominators, which in this case would be 10xyz.
- by alexander.vien
Tue Jan 29, 2013 1:06 pm- Forum: Problem Solving
- Topic: Machine A and Machine B - Problem Solving
- Replies: 6
- Views: 2230
- by alexander.vien
Mon Jan 28, 2013 3:59 pm- Forum: Problem Solving
- Topic: PROBLEM SOLVING
- Replies: 9
- Views: 3658
If you think the answer choice is A, then I think the step that you're missing is on the second function, 1/g(x). When we plug in (x^2+2)/(x-1) into 1/g(x) it's equivalent to division, so we must flip the expression and multiply it by 1 (also known as taking the reciprocal). Thus, we have (x-1)/(x^2...
- by alexander.vien
Mon Jan 21, 2013 5:34 pm- Forum: Problem Solving
- Topic: function malfunction
- Replies: 6
- Views: 1451
Very helpful. I think I'll review some math stuff here and there when I feel like I might be forgetting something. Devoting time to Verbal will allow me to really hone my skills and maybe get me into that mid-40 range.
Thanks Brent!
- by alexander.vien
Mon Jan 21, 2013 3:25 pm- Forum: The 60-Day GMAT Study Guide
- Topic: Day 23 - How to keep math fresh when moving to verbal
- Replies: 2
- Views: 1328
Day 23 - How to keep math fresh when moving to verbal
Hi Brent et. al, So, I'm on Day 23 of the guide today after taking GMAT Prep #1 for the second time yesterday. I'm seeing improvement! On my first take I scored a 660 (Q42 V38) and yesterday I managed to improve to a 700 (Q47 V39). I'm much more confident in math after the first 22 days and somehow ...
- by alexander.vien
Mon Jan 21, 2013 2:37 pm- Forum: The 60-Day GMAT Study Guide
- Topic: Day 23 - How to keep math fresh when moving to verbal
- Replies: 2
- Views: 1328
How to calculate SD will not be tested on the GMAT - in many cases you don't even need to know the general formula - only how SD changes when things are added/subtracted from a set. That being said, this question requires no calculation. You have 6 water tanks (kind of like saying you have 6 terms i...
- by alexander.vien
Thu Jan 17, 2013 4:04 pm- Forum: Data Sufficiency
- Topic: experiment
- Replies: 5
- Views: 1362
Also want to point out for this question that a quick way of knowing B is sufficient is the rule that states that if two numbers are both multiplies of a certain number, adding or subtracting them will generate an answer that is a multiple of that same number. For example: 35 (multiple of 7) - 21 (m...
- by alexander.vien
Wed Jan 16, 2013 12:16 pm- Forum: Data Sufficiency
- Topic: if x and y are positive integers such that x = 8y + 12,
- Replies: 6
- Views: 6800
B is not sufficient because it doesn't give a concrete definition of what a clean number is. it gives one parameter - that it must be odd. But it doesn't define what a clean number is.
Statement A defines what a clean number is - an integer divisible by only 2 factors, one of which is greater than 2.
- by alexander.vien
Tue Jan 15, 2013 6:04 pm- Forum: Problem Solving
- Topic: Probability Question
- Replies: 2
- Views: 2445
Much easier way to do this - use the 3 Venn Diagram method that MGMAT teaches. Draw 3 circles each with an overlap for both and with a area for "all 3" in the middle. Then, simply work from inside/out. Fill in 5, 3, and 4 for all the "both" sections. Then, for each individual cir...
- by alexander.vien
Mon Jan 14, 2013 6:01 pm- Forum: Problem Solving
- Topic: MGMAT Chapter 7 word translations # 7 ( video category)
- Replies: 5
- Views: 1670
GCD or Greatest Common Divisor = GCF or Greatest Common Factor Whenever the word "divisor" is seen in a GMAT question, it can be replaced with "factor" - since factors and multiples are what most study when preparing for the GMAT. Just wanted to clarify since this constantly conf...
- by alexander.vien
Wed Jan 02, 2013 6:55 pm- Forum: Data Sufficiency
- Topic: if x and y are positive integers such that x = 8y + 12,
- Replies: 6
- Views: 6800
Reviewing Practice Questions and Practice Tests
Hi all, I'm on Day 7 of the study guide and I'm just curious as to how much time should be spent reviewing practice problems each day? I've talked to tutors before that have said to always do the practice problems in 37 question blocks timed w/ 75 minutes and then review afterwards by using a spread...
- by alexander.vien
Mon Dec 31, 2012 7:27 pm- Forum: The 60-Day GMAT Study Guide
- Topic: Reviewing Practice Questions and Practice Tests
- Replies: 1
- Views: 1000
Thanks Brent! Much appreciated. I was getting confused on the way to add the exponents because I always thought the bases needed to be the same. But your examples helped be understand that the coefficient near the variable can be separated with multiplication. 3m^n = 3 * m^n (m^n-2)(3m^2) = (m^n-2 *...
- by alexander.vien
Mon Dec 31, 2012 12:35 pm- Forum: Problem Solving
- Topic: Exponents Question!
- Replies: 2
- Views: 1221
Using the forumla for 3 overlapping sets this problem is not as difficult as it may seem. (Set A) + (Set B) + (Set C) - (Total in 2 of 3 sets) - 2(Total in all 3 sets) + Neither First off, notice the problem says everyone belongs to at least 1 of the groups. That eliminates the "Neither". ...
- by alexander.vien
Mon Dec 31, 2012 12:14 pm- Forum: Problem Solving
- Topic: OG 13 #178 - Virtual Reality
- Replies: 22
- Views: 15104
Exponents Question!
I'm having trouble understanding the following exponents simplification question: Simplify: m^n-2 + 3m^(n) - 4m^(n+1) Answer: [spoiler]m^n-2 is the GCF of all the terms - factor it out to obtain m^n-2(1 + 3m^2 - 4m^3)[/spoiler] How is that the GCF? I don't get how you factor that out of all the othe...
- by alexander.vien
Mon Dec 31, 2012 11:33 am- Forum: Problem Solving
- Topic: Exponents Question!
- Replies: 2
- Views: 1221