Search found 283 matches
Which of the following describes all the values of y for which y < y2 ? 1 < y −1 < y < 0 y < −1 1/y < 1 0 < y < 1 OA D All values of B and C also satisfy the given condition. Somebody please explain I'm assuming y2 = y^2 y < y^2 This is true for all positive values of y > 1 ____________(set 1) ...
- by ganeshrkamath
Wed Nov 20, 2013 6:18 am- Forum: Problem Solving
- Topic: Which of the following describes all the values of y
- Replies: 4
- Views: 2463
Well done! As you beat the system, I have now made the question more interesting: Can it be that s*c is not equal to any multiple of 3? Thank you. For S*c to be not equal to a multiple of 3: c shouldn't be a multiple of 3 Let c = 5 (the next smallest odd number) Again, average of the c consecutive ...
- by ganeshrkamath
Wed Nov 20, 2013 6:04 am- Forum: Problem Solving
- Topic: Sum survey challenge (made up)
- Replies: 6
- Views: 1778
What are the first six digits of 1/9+1/99+1/999, if expressed as a decimal? a .122123 b .122213 c .123123 d .123212 e .123321 a/9 = 0.aaaaa... ab/99 = 0.abababab... abc/999 = 0.abcabcabc... (a,b,c are digits) 1/9 = 0.111111... 01/99 = 0.010101... 001/999 = 0.001001... Sum = 0.122213... Choose B Che...
- by ganeshrkamath
Wed Nov 20, 2013 3:08 am- Forum: Problem Solving
- Topic: Numbers
- Replies: 6
- Views: 2338
Anne and Beth will participate in a sack race (In a sack race, people hop to reach the finish line). In the time that Anne takes 3 hops, Beth takes 4 hops but the distance covered by Anne in 4 hops is equal to distance covered by Beth in 5 hops. What is the ratio of Anne’s speed: Beth’s speed? ...
- by ganeshrkamath
Wed Nov 20, 2013 12:27 am- Forum: Problem Solving
- Topic: Hops - Time and Distance
- Replies: 1
- Views: 1423
If S is the sum of c consecutive integers where S < 100,c>1 and s * c = n^2 (where n is also an integer), can the following statement be true? s*c is not equal to 81. S = (average of c consecutive integers) * c S = (average of c consecutive integers) * c S*c = (average of c consecutive integers) * ...
- by ganeshrkamath
Wed Nov 20, 2013 12:23 am- Forum: Problem Solving
- Topic: Sum survey challenge (made up)
- Replies: 6
- Views: 1778
To do a certain work B would take three times as long as A and C together. And C twice as long as A and B together. The the men complete the work together in 10 days. How long would each one of them take? A) 22,40,35 B) 18,36,42 C) 24,40,30 D) 22,36,40 I need a simple solution. I did get the answer...
- by ganeshrkamath
Tue Nov 19, 2013 10:33 pm- Forum: Problem Solving
- Topic: time and work
- Replies: 2
- Views: 6603
Q: Factorize (x^4 + 4 ): (A) (x^2 + 2)^2 (B) (x^2 + 2x + 2)(x^2 - 2x + 2 ) (C) (x^2 + 2)(x^2 - 2) (D) (x^2 + 4)(x^2 - 4) (E) (x^2 - 1)(x^2 + 1) NB: Now Brent has earlier mentioned in my previous post that sum of squares can not be factored. I would like to know how much that proposition is applicab...
- by ganeshrkamath
Tue Nov 19, 2013 3:15 am- Forum: Problem Solving
- Topic: Factors
- Replies: 16
- Views: 2927
In solution authors use miles per hour to represent speed, but feet to represent distance. Shouldn't we first choose one measurement? e.g. use only feet both for speed and distance or only miles for speed and distance. Can we divide feet by miles? I always thought that no. Could anybody please clar...
- by ganeshrkamath
Tue Nov 19, 2013 3:07 am- Forum: Problem Solving
- Topic: 13th edition. Problem solving, â„– 70
- Replies: 3
- Views: 1128
Got this problem wrong too. Thanks for your explanation in advance! I suggest going for the general method that I follow for work-related problems: Small pump takes two hours to fill the tank. So, in one hour it can fill half the tank. Rate at which the small pump fills the tank = 1/2(V) per hour _...
- by ganeshrkamath
Mon Nov 18, 2013 12:36 am- Forum: Problem Solving
- Topic: How many hours to fill this water tank?
- Replies: 5
- Views: 1541
Hi. I barely missed this problem as I couldn't recall the formula.. I guess it falls under "Number Properties" Can you help me recall? Number of ways to select r items out of n unique items = nCr = n! / ((n-r)!*r!) In this case: r = 2 n = 12 12C2 = 12! / ((12-2)!*2!) = 12! / (10! * 2!) = ...
- by ganeshrkamath
Mon Nov 18, 2013 12:26 am- Forum: Problem Solving
- Topic: Can you recall the formula for this?
- Replies: 5
- Views: 1427
$500 per kilogramyumi2012 wrote:Always appreciate your help in solving this!
= $500 per 10^6 milligrams
= X per 600 milligrams
X = 600*500/10^6
= 30*10^4/10^6
= 30/100
= $0.3
Choose A
Cheers
- by ganeshrkamath
Mon Nov 18, 2013 12:00 am- Forum: Problem Solving
- Topic: The cost of the ingrediant?
- Replies: 2
- Views: 926
The answer is the last one.. however, I can't figure out how it works.. (there's no explanation on the practice exam) f(a+b) = f(a) + f(b) Option 1: f(x) = x^2 f(a+b) = (a+b)^2 f(a) + f(b) = a^2 + b^2 Eliminate. Option 2: f(x) = x + 1 f(a+b) = (a+b) + 1 f(a) + f(b) = (a + 1) + (b + 1) = a + b + 2 E...
- by ganeshrkamath
Sun Nov 17, 2013 11:52 pm- Forum: Problem Solving
- Topic: Last problem for today..
- Replies: 3
- Views: 1146
If 4/x < 1/3, what is the possible range of values for x? Answer [spoiler]x<0 and x>12[/spoiler] x can be either positive or negative. Case 1: x is positive 4/x < 1/3 x > 12 Case 2: x is negative => x = -m _______m is a positive number 4/(-m) < 1/3 -4/m < 1/3 This is true for all positive numbers m...
- by ganeshrkamath
Tue Nov 12, 2013 8:29 pm- Forum: Problem Solving
- Topic: inequality question ..please help
- Replies: 6
- Views: 1374
If integer k is equal to the sum of all even multiples of 15 between 295 and 615, what is the greatest prime factor of k? -5 -7 -11 -13 -17 Ans. C 300,330,...,600 This series is an arithmetic progression. The difference d between any two consecutive terms is a constant (=30). The sum of such series...
- by ganeshrkamath
Mon Nov 11, 2013 8:55 am- Forum: Problem Solving
- Topic: MGMAT CAT 1: PS Problem
- Replies: 4
- Views: 1293
Answer the questions with a Yes,No or Cannot be determined. 1.If a is divided by 7 or by 18,an integer results.Is (a/42) an integer? 2.If j is divisible by 12 and 10,is j divisible by 24? These problems are from Manhattan Number Properties guide.What I fail to understand is the difference between t...
- by ganeshrkamath
Mon Nov 11, 2013 6:53 am- Forum: Problem Solving
- Topic: Manhattan GMAT-Hey-Im a little confused here
- Replies: 5
- Views: 1350