Search found 17 matches
Chris (or anyone), I need some clarifications. Could you explain what is meant by "rates are additive"? Did you mean "rates are additive" in "work done" type problems? In normal rate-distance type problems, rates cannot be added, right? For example: A bus goes from Stat...
- by roh00kan
Sat Jan 29, 2011 12:15 pm- Forum: Problem Solving
- Topic: Work rate
- Replies: 30
- Views: 15481
A construction company was paid a total of $500,000 for a construction project. The company’s only costs for the project were for labor and materials. Was the company’s profit for the project greater than $150,000? (1) The company’s total cost was three times its cost for materi...
- by roh00kan
Wed Sep 08, 2010 10:33 am- Forum: Data Sufficiency
- Topic: Profit
- Replies: 8
- Views: 1514
In GMAT "value" of a number depends on the statements. In Math, if a number has anything after 'decimal', then that number is considered to be a real number, not a whole or an integer number. Therefore, even or odd designation can only apply to integers. This is specifically applied in sci...
- by roh00kan
Tue Sep 07, 2010 11:01 pm- Forum: Data Sufficiency
- Topic: is X odd?
- Replies: 3
- Views: 1251
This question says |x| > |y| > |z|. So, we are sure that |x| not equal to |y| not equal to |z|. Looking at the answer choices, either A or B could be the answer. A => says x + y = 0. That is x = -y. This cannot be true as per the question. B => says y - z = 0 cannot be correct. Choice B says, y = z,...
- by roh00kan
Thu Sep 02, 2010 7:40 am- Forum: Problem Solving
- Topic: What's your answer?
- Replies: 10
- Views: 2016
- by roh00kan
Sat Aug 28, 2010 1:40 am- Forum: Problem Solving
- Topic: probability haunts
- Replies: 15
- Views: 2560
Rahul@gurome,
Fantastic Explanation! Well, are you sure that in GMAT one should try your method to solve this problem under 2 minutes?
Then, I am sure, I will not be one of your students. BTW, did you solve it under 2 minutes?
- by roh00kan
Wed Aug 25, 2010 8:05 am- Forum: Problem Solving
- Topic: Interest rate formula
- Replies: 6
- Views: 3968
Basically, 'x' - the time to read 108 pages is 27/7. Since Brian needs additional 3 hours to read 192, the total time required for Brian to read 300 (108+192) is x+x+3 = 2x+3 Now 2x+3 is the time. We need the Avg rate. So we need to divide total pages Brian read with total time. Avg Rate = 300/(2x+3...
- by roh00kan
Tue Aug 24, 2010 12:12 am- Forum: Problem Solving
- Topic: Employee Task
- Replies: 16
- Views: 3501
Do you know the Answer? I guess, Nothing great in this prob. We need to find out the necessary terms. Since this is addition table, we can set up the following equations 1st Row: 4 + x = 1 ==> x = -3 4 + y = -5 ==> y = -9 2nd Row: e + (-3) = 7. So e = 10 So n = e + y = 10 + (-9) = 1 10 = e + z = 10 ...
- by roh00kan
Mon Aug 23, 2010 11:38 pm- Forum: Problem Solving
- Topic: GMAT Prep Table Question
- Replies: 3
- Views: 1146
The prob is basically asking approximately how many people does the population increase in 1 day. We have given the rate of people born in every 2 seconds. Rate of born = 9 people per 2 seconds. We have also given the rate of people die in every 2 seconds. Rate of death = 3 people per 2 seconds So t...
- by roh00kan
Mon Aug 23, 2010 8:24 pm- Forum: Problem Solving
- Topic: population increase problem
- Replies: 1
- Views: 973
KVCPK, Thank you very much.
Well, I understood my mistake. I was considering the 'x' of 1/x as +ve and when I multiplied 'x' on both sides, I didn't reverse the sign as I was thinking that, 'x' is +ve.
- by roh00kan
Wed Aug 18, 2010 10:31 pm- Forum: Data Sufficiency
- Topic: Is |x| < 1?
- Replies: 8
- Views: 1763
gmatmachoman, thanks for your reply. I do agree with you.
But my question is different. I was asking how did previous 2 respondents, before you, get
-x^2>1
x^2<-1
and then they deduce that statement 2 is also sufficient and hence the answer is D. Am I missing something here?
Thanks
- by roh00kan
Wed Aug 18, 2010 10:39 am- Forum: Data Sufficiency
- Topic: Is |x| < 1?
- Replies: 8
- Views: 1763
I didn't understand the statement 2 explanation. |x| < 1/x If x is +ve, x < 1/x ==> x^2 < 1. This is okay. ---(a) If x is -ve, -x < 1/x ==> -x^2 < 1 {multiplied by x on both sides}. OR x^2 > -1. This means, x^2 is > zero. --- (b) {squares cannot be negative} Since, (a) says x^2 < 1 and (b) says x^2 ...
- by roh00kan
Wed Aug 18, 2010 1:08 am- Forum: Data Sufficiency
- Topic: Is |x| < 1?
- Replies: 8
- Views: 1763
Nidhitanti,
the calculation goes like this:
3*15*x% + 2*18*y% = $9.00
45x/100 + 36y/100 = $9.00
45x + 36y = 9*100 ---> (1)
x + y = 22 ---> (2)
Statement 2* 45 = 45x + 45y = 22*45
Subtract statement 1 from this,
9y = 20*45+2*45-900 = 90
y = 90/9 = 10
- by roh00kan
Mon Aug 16, 2010 2:43 am- Forum: Problem Solving
- Topic: Difficult Math Question #47 - Arithmetic
- Replies: 4
- Views: 4852
Most of the time, GMAT Geometry problems can be solved by more than one ways. That is the beauty of geometry. I go like this: Problem 1: We have following information; radius (9), angle ORP = 35, Lines PQ and OR are parallel. Let C be the center of the circle. So basically we need to find the ∠QCP...
- by roh00kan
Mon Aug 16, 2010 2:11 am- Forum: Problem Solving
- Topic: 2 Coordinate geometry questions - source: GmatPrep
- Replies: 3
- Views: 1515
Can't we approach this problem like this? When positive integer n is divided by 5 the remainder is 1. when n is divided by 7, the remainder is 3. what is the smallest positive k such that k+n is a multiple of 35? n = 5*a + 1 n = 7*b + 3, where a and b are two different integers. 5a + 1 = 7b + 3 Ther...
- by roh00kan
Fri Aug 13, 2010 9:00 pm- Forum: GMAT Math
- Topic: Beat the gmat community! help me !
- Replies: 5
- Views: 2328