Search found 35 matches
Am not getting this part " new algorithm comes out which reduces the number of calculations by the factor of 10" does it mean 3.6 X 10^11/10!? Could u help me out in knowing the correct approach?[/u] It doesn't mean 10!, it just means divided by 10, i.e. 3.6 X 10^11/10 1000 reduced by fac...
- by mkdureja
Fri Jun 07, 2013 3:11 am- Forum: Problem Solving
- Topic: Computer Problem(Percent decrease)
- Replies: 2
- Views: 1234
Two secrarties,Sally and lisa,type at even but diffrence paces.Sally is more expeienced and types 80 characters per minute.Lisa a beginner can type only 30 char per minute.On one day,Lisa starts typing before sally.At somepoint both have typed the same number of characters.Then both continue typing...
- by mkdureja
Fri Jun 07, 2013 3:04 am- Forum: Problem Solving
- Topic: Rate problem:Typist(Easy approach z needed..:)
- Replies: 3
- Views: 1394
I knw something is wrong with my approach but I wanna understand y? Select 3 guys out of 9 -- 9C3 .. And then send them to any of 3 locations . 3C1 so answer is 9C3* 3C1 = 252.. Why is this wrong approach? Pls explain .. will be helpful Sending them to any of the three locations wont be 3C1. Sendin...
- by mkdureja
Fri Jun 07, 2013 1:54 am- Forum: Problem Solving
- Topic: Counting Problem - Company recruitment
- Replies: 10
- Views: 8700
For any positive integer x to have x unique factors means that it must be a multiple of every integer from 1 to x.
So, x must be a factor of x-1, which can't be true for any x > 2.
So, x = 2 is the only solution.
- by mkdureja
Thu Jun 06, 2013 7:48 am- Forum: Data Sufficiency
- Topic: Manhattan Number Prop.DS question not understood
- Replies: 4
- Views: 1514
Rate of reaction(R) is directly proportional to square of the concentration of chemical A present (A) means, R = pA² (p is some constant) and inversely proportional to concentration of chemical B (B) means, R = q/B Combining, R = x * A² / B Concentration of B is doubled, so B becomes 2B. Assume th...
- by mkdureja
Thu Jun 06, 2013 7:38 am- Forum: Problem Solving
- Topic: help
- Replies: 3
- Views: 1366
Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m. By what percent did the ratio of price per share to earnings per share increase, in terms of k and m? A. k/m % B. (k - m) % C. [100(k - m)] / (100...
- by mkdureja
Tue May 28, 2013 4:42 am- Forum: Problem Solving
- Topic: Algebra - Percents
- Replies: 3
- Views: 1470
How do you add numbers? 568 + 345 = ??? Last digit ( 8 + 5 = 13 --- 3 is last digit and 1 carry) tens digit ( 6 + 4 + 1(carry) = 11 --- 1 is tens digit and 1 carry) hundreds digit = 5 + 3 + 1(carry) = 9 or, 568 + 345 = 913 See here, sum of ten's digit 6 and 4 is 10, but tens digit of the sum is '1'....
- by mkdureja
Tue May 28, 2013 4:30 am- Forum: Problem Solving
- Topic: number system
- Replies: 3
- Views: 1016
If N is a positive integer and TN is the sum of all the positive integers from 1 to N, inclusive, is N even? (1) TN is even. (2) T2N is even. OA is 2 What do you mean by T2N is even? Statement 1 is not sufficient alone, explanation is: Tn = n * (n+1)/2 ( Number of terms * Average) Tn is even means,...
- by mkdureja
Tue May 28, 2013 4:01 am- Forum: Data Sufficiency
- Topic: please help
- Replies: 2
- Views: 1133
Question: Is xy + xy < xy ? (1) x^2 / y < 0 (2) x^9 (y^3)3 < (x^2)4 y^8 My Solution: Rephrase the Question: is xy<0? or are x and y of opposite sign? From 1. Y is negative. No idea about X - Not sufficient From 2. (XY)^9 - (XY)^8 < 0 (XY)^8 (XY - 1)<0 (XY)^8 - always positive, therefore XY-1<0 or X...
- by mkdureja
Tue May 28, 2013 2:14 am- Forum: Data Sufficiency
- Topic: Inequality - Please help me with my approach
- Replies: 2
- Views: 1225
if m = 4n + 9, where n is a positive integer. What is the greatest common factor of m and n? 1. m = 9s, where s is a positive integer. 2. n = 4t, where t is a positive integer. OA is A Statement 1: m=9s n=9(s-1)/4 For n to be an integer, s must be of form 4t+1 So, n = 9t and m = 9 (4t+1) HCF of m a...
- by mkdureja
Tue May 28, 2013 12:56 am- Forum: Data Sufficiency
- Topic: help
- Replies: 1
- Views: 983
I found this in GMAT Prep Now Data Sufficiency. I just want to understand it. If K is an integer greater than 1, and S is the sum of all positive divisors of K, is S > K+1? So in GMAT Prep Now Video, they paraphrased it to "Is K not prime?" I just wanted to know how one can tell using giv...
- by mkdureja
Tue May 28, 2013 12:03 am- Forum: Data Sufficiency
- Topic: Prime and Composite
- Replies: 2
- Views: 936
I found this in GMAT Prep Now Data Sufficiency. I just want to understand it. If K is an integer greater than 1, and S is the sum of all positive divisors of K, is S > K+1? So in GMAT Prep Now Video, they paraphrased it to "Is K not prime?" I just wanted to know how one can tell using giv...
- by mkdureja
Tue May 28, 2013 12:02 am- Forum: Data Sufficiency
- Topic: Prime and Composite
- Replies: 2
- Views: 936
Both a, b, and c are 3-digits integers, where a=b+c. Is the hundreds' digit of number a equal to sum of that of b and c? 1). Tens' digit of a=tens' digit of b+tens' digit of c 2). Units' digit of a=units' digit of b + units' digit of c my take E If Tens' digit of a=tens' digit of b+tens' digit of c...
- by mkdureja
Mon May 27, 2013 11:52 pm- Forum: Problem Solving
- Topic: number system
- Replies: 3
- Views: 1016
Each of 90 students participated at least 1 of the track tryouts: High jump, long jump, 100 meter dash. If 20 students participated in high jump tryout, 40 students participated in the long jump tryout and 60 students participated in the 100 meter dash tryout, and if 5 students participated in all ...
- by mkdureja
Fri May 24, 2013 3:39 am- Forum: Problem Solving
- Topic: 3 Overlapping sets
- Replies: 5
- Views: 3455
http://s24.postimg.org/n7c01grq9/googletriangle.jpg In the diagram above, what is the value of y? (1) x = 5 (2) a = b Answer B Can anyone point me to more examples of understanding this property of the triangle? I am struggling to understand how we can establish side y just by knowing that a and b ...
- by mkdureja
Fri May 24, 2013 2:01 am- Forum: Data Sufficiency
- Topic: Property of a triangle within a triangle
- Replies: 11
- Views: 2940