Search found 22 matches
- by muna_m
Mon Aug 03, 2009 8:04 am- Forum: Problem Solving
- Topic: Rate & Work
- Replies: 4
- Views: 1309
Rate & Work
Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets? Can somebody plz post the explanation for th...
- by muna_m
Mon Aug 03, 2009 5:17 am- Forum: Problem Solving
- Topic: Rate & Work
- Replies: 4
- Views: 1309
Prime numbers
If y ≠ 3 and 2x/y is a prime integer greater than 2, which of the following must be true?
I. x = y
II. y = 1
III. x and y are prime integers.
(A) None
(B) I only
(C) II only
(D) III only
(E) I and II
- by muna_m
Wed Jul 29, 2009 11:11 am- Forum: Problem Solving
- Topic: Prime numbers
- Replies: 2
- Views: 1246
- by muna_m
Tue Jun 23, 2009 12:09 pm- Forum: Data Sufficiency
- Topic: Inequalities
- Replies: 5
- Views: 1591
1) x² - 5x + 6 < 0 (x-2)(x-3)<0 meaning that x>2 and x<3 sufficient provides 2<x<4 to be true 2) 5x² - 25x > 0 (5x-25)(x)>0 meaning x<0 and x>5 sufficient, provides 2<x<4 to be false 1) (x-2) (x-3) < 0 How can you conclude x>2 and x<3? Why not x<2 and x>3? Also, should 2) be x>0 and x>5 or x<0 and ...
- by muna_m
Tue Jun 23, 2009 5:31 am- Forum: Data Sufficiency
- Topic: Inequalities
- Replies: 5
- Views: 1591
- by muna_m
Sat Jun 20, 2009 3:08 pm- Forum: Problem Solving
- Topic: Sum of even numbers
- Replies: 5
- Views: 1699
Sum of even numbers
The sum of the even numbers between 1 and n is 79*80, where n is an odd number, then n=? I know we can solve it using AP. But, I approached it using no. of terms & average and was stuck. No. of terms (even) = (n-1-2)/2 = (n-1)/2 terms Average = (2+n-1)/2 = (n+1)/2 Thus,Sum = No of terms * Avg 79...
- by muna_m
Fri Jun 19, 2009 12:16 pm- Forum: Problem Solving
- Topic: Sum of even numbers
- Replies: 5
- Views: 1699
Range of a Prime number?
h(n) is the product of the even numbers from 2 to n, inclusive, and p is the least prime
factor of h(100)+1. What is the range of p?
Can somebody please help me on this one.
Thanks!
- by muna_m
Fri Jun 19, 2009 9:01 am- Forum: Problem Solving
- Topic: Range of a Prime number?
- Replies: 1
- Views: 1233
If u consider it to be a cube, with area of face = 40
then like you said a = Sqrt(40)
But answer would be B because you can find the volume of a cube when you know one side.
If statement two does not mean its a cube but a cuboid, then I would say E.
- by muna_m
Thu Jun 18, 2009 10:55 am- Forum: Data Sufficiency
- Topic: OG 12 Qn-122
- Replies: 5
- Views: 1605
- by muna_m
Tue Jun 16, 2009 8:40 pm- Forum: Data Sufficiency
- Topic: Inequalities Concepts Please
- Replies: 2
- Views: 2087
Inequalities Concepts Please
Hello All, First I'd like to thank everyone for making BTG such a great learning experience. Great job! Now I have bit of a trouble with the inequalities especially on DS questions. Can anybody help me out here? I want to know what are the concepts to keep in mind. I came across a great post by Ian ...
- by muna_m
Tue Jun 16, 2009 2:02 pm- Forum: Data Sufficiency
- Topic: Inequalities Concepts Please
- Replies: 2
- Views: 2087
combine 1 and 2 x>=0 because you can't find sqrt(-ve number). you can but complex numbers are not in the syllabus:) so you are left with two options to check for: positive values and fractions for fractions if x^3>y x>y for positive values x^1/2>y so x>y^2 so x>y I dont get this. What numbers have ...
- by muna_m
Tue Jun 16, 2009 11:55 am- Forum: Data Sufficiency
- Topic: manhattan question
- Replies: 8
- Views: 1537
- by muna_m
Thu Jun 11, 2009 6:56 am- Forum: Problem Solving
- Topic: Problem Solving for 780+ Aspirants.
- Replies: 209
- Views: 63792
For the second question - I get 36 too and raleigh has explained it well.
But wondering what is the OA? I see 28 marked on the attachment!
- by muna_m
Thu Jun 04, 2009 12:27 pm- Forum: Problem Solving
- Topic: Gmat Prep: Profit / Loss & Rate
- Replies: 8
- Views: 1907
- by muna_m
Thu Jun 04, 2009 11:49 am- Forum: Problem Solving
- Topic: I'm terrible at geometry!
- Replies: 10
- Views: 5406