Search found 12 matches
Hello Mitch, Ran into this questions just yesterday on a practice test and got it wrong. I also went for the plug in approach but then I got a little nervous because I thought I might need to test other values like negative integers in order to prove it. I notice you went for numbers other than 0 or...
- by lazarogb
Sun Mar 03, 2013 7:20 am- Forum: Problem Solving
- Topic: GMAT Prep Test - Strange Operator Question
- Replies: 3
- Views: 1648
- by lazarogb
Sun Dec 09, 2012 7:16 am- Forum: Data Sufficiency
- Topic: Geometry - Hard- Gmat Prep
- Replies: 2
- Views: 2354
Hi All Can anyone please help me out by solving the following equation using the formula X^2+20X-8000 Formula: -b+-((b^2 - 4ac)^1/2)/2a I'll start by mentioning that X^2+20X-8000 is not an equation. I think you mean x^2 + 20x - 8000 = 0 I've never seen an official GMAT question that requires us to ...
- by lazarogb
Sun Dec 09, 2012 6:18 am- Forum: Problem Solving
- Topic: Quadratic Equation using formula
- Replies: 5
- Views: 1789
Quadratic formula - GMAT prep - Hard
By how much does the larger root of the equation 2x^2+5x=12 exceed the smaller root? a) 5/2 b) 10/3 c) 7/2 d) 14/3 e) 11/2 OA E I tried the normal factoring strategy trying out fraction that would fit but never reached anywhere. The OA from the gmat guys use the quadratic formula which I had never s...
- by lazarogb
Sun Dec 09, 2012 6:15 am- Forum: Problem Solving
- Topic: Quadratic formula - GMAT prep - Hard
- Replies: 3
- Views: 2842
Geometry - Hard- Gmat Prep
The figure above shows a construction plan for the intersection of three straight roads, each having parallel edges and each having the same width. What is the value of t? 1) r=140 2) s=160 OA C The official answer is very tricky, I would like to know if anyone can come up with a simple solution. Th...
- by lazarogb
Sun Dec 09, 2012 5:15 am- Forum: Data Sufficiency
- Topic: Geometry - Hard- Gmat Prep
- Replies: 2
- Views: 2354
A certain cake has two layers - Gmat Prep
A certain cake has two layers with pieces of fruit on top of each layer. Of all the pieces of fruit on the cake, 25 percent are strawberies. How many pieces of fruit are on the first layer of the cake? 1) Of the pieces of fruit on the first layer, 6 are strawberries. 2) 20 percent of the 20 pieces o...
- by lazarogb
Sat Dec 01, 2012 3:55 am- Forum: Data Sufficiency
- Topic: A certain cake has two layers - Gmat Prep
- Replies: 3
- Views: 2248
Source is from the extension package for the gmat prep software
i got confused and thought b+w>50000, but it should be b>50000 and w>50000
now i get it! thx!
- by lazarogb
Sun Nov 25, 2012 5:57 am- Forum: Problem Solving
- Topic: From new GMATprep Qn - Experts help please
- Replies: 4
- Views: 1700
Hello Mitch, Why did you rewrite x^2+y^2 into (x+y)(x-y)? Because normally for us to be able to rewrite it like that we would need a difference of squares and not a sum. Maybe the post did not specify that the squares were being added or perhaps I am missing something. The wording of the question s...
- by lazarogb
Sat Nov 24, 2012 12:56 pm- Forum: Data Sufficiency
- Topic: if x and y are integers
- Replies: 7
- Views: 2029
if x and y are integer, what is the remainder when x^2 and y^2 is divided by 5? (1) when x-y is divided by 5, the remainder is 1 (2) when x+y is divided by 5, the remainder is 2 OA: C Question rephrased: What is the remainder when (x+y)(x-y) is divided by 5? Statement 1: When x-y is divided by 5, t...
- by lazarogb
Sat Nov 24, 2012 11:57 am- Forum: Data Sufficiency
- Topic: if x and y are integers
- Replies: 7
- Views: 2029
Hi Massi: The OA should be D. We are given speed from a-b = Sab = 80; speed from b-c = Sbc =60 1) Average speed = (total distance)/(total time); let distance from b-c = d; then distance from a-b = 4d; then time from b-c = distance/speed = d/60 ; time from a-b = 4d/80. Then average speed = (d+4d)/(d...
- by lazarogb
Wed Nov 21, 2012 11:18 am- Forum: Data Sufficiency
- Topic: GMATPrep Question Pack 1
- Replies: 5
- Views: 4320
DS - Range Question - Gmat Prep Extension Pack - Hard
In a recent survey, twenty families reported their incomes for 1995. Was the range of reported 1995 incomes for these families greater than $60,000? 1) Thirteen of the reported incomes were between $20,000 and $35,000. 2) Seven of the reported incomes were between $80,000 and $95,000. I had C Origin...
- by lazarogb
Sun Nov 18, 2012 7:42 am- Forum: Data Sufficiency
- Topic: DS - Range Question - Gmat Prep Extension Pack - Hard
- Replies: 9
- Views: 3314
Hello Brent,
This question is from the "extended package" you can buy for the Gmat Prep software.
I guess it is real GMAT material.
- by lazarogb
Sun Nov 18, 2012 7:27 am- Forum: Problem Solving
- Topic: Scales problem
- Replies: 8
- Views: 5737