Search found 114 matches
Q. The average score of x number of exams is y. When an additional exam of score z is added in, does the average score of the exams increase by 50%? (1) 3x = y (2) 2z - 3y = xy Please opine on how to resolve the above problem. Agree with B. The question in the sense of variables is: Whether z = y +...
- by Fiver
Tue Jul 19, 2011 3:02 am- Forum: Data Sufficiency
- Topic: Average score
- Replies: 3
- Views: 1820
If a and b are consecutive positive integers, is LCM(ab, b+1) divisible by 6? (1) b is divisible by 3 (2) a<b OA is D . I'm somehow not able to prove that statement (2) is enough. Detailed explanations would be appreciated. For a number to be divisible by 6, it needs to be divisible by atleast both...
- by Fiver
Tue Jul 19, 2011 2:39 am- Forum: Data Sufficiency
- Topic: LCM
- Replies: 5
- Views: 1574
Q. Train A leaves New York for Boston at 3 PM and travels at the constant speed of 100 mph. An hour later, it passes Train B, which is making the trip from Boston to New York at a constant speed. If Train B left Boston at 3:50 PM and if the combined travel time of the two trains is 2 hours, what ti...
- by Fiver
Tue May 31, 2011 5:40 am- Forum: Data Sufficiency
- Topic: Speed and Distance problem
- Replies: 3
- Views: 1285
Is X>0 and Y>0, is (X-a)/(Y-a) < X/Y? 1. X>Y 2. a>0 Given that both X & Y are positive, is (X-a)/(Y-a) < X/Y? Since it is given that Y>0, multiply by Y on both sides Is Y(X-a)/(Y-a) < X St1]X>Y So if Y(X-a)/(Y-a) < Y, then automatically the answer to our question is YES. Is (X-a)/(Y-a) < 1? Her...
- by Fiver
Tue May 31, 2011 4:22 am- Forum: Data Sufficiency
- Topic: Fractions
- Replies: 3
- Views: 1172
X and Y work at constant rates, how many more hours does it take machine y, alone, to fill an order of a certain size than machine X alone. a. X and Y together fill order in 2�3 the time that X alone does b. Y alone does it in twice the time as X alone does OA is E I selected the correct option b...
- by Fiver
Wed May 25, 2011 5:19 am- Forum: Data Sufficiency
- Topic: Rate of work
- Replies: 4
- Views: 1243
If x y z ≠0, is x (y + z) ≥ 0? [1] |y + z| = |y| + |z|. [2] |x + y| = |x| + |y|. [spoiler]Source: www.avenuesabroad.org[/spoiler] If any one of x, y or z is -ve, while both the others are =ve, then the answer is no. If any one is negative, while both the others are +ve, while either has the sa...
- by Fiver
Fri Sep 17, 2010 7:31 am- Forum: Data Sufficiency
- Topic: x y z ≠0, is x (y + z) ≥ 0?
- Replies: 3
- Views: 3018
The integers m and p are such that 2 < m < p and m is not a factor of p. If r is the remainder when p is divided by m, is r > 1? [1] The greatest common factor of m and p is 2. [2] The least common multiple of m and p is 30. [spoiler]Source: www.avenuesabroad.org[/spoiler] Given that r > 0; to find...
- by Fiver
Fri Sep 17, 2010 7:24 am- Forum: Data Sufficiency
- Topic: m is not a factor of p
- Replies: 1
- Views: 1213
How many different prime factors contribute to the form the positive integer n ? St1] Four different prime numbers are factors of 2 n. This means that the prime number 2 either could be a part of 'n' itself, yeilding 4 as the answer or could not be a part of 'n' yeilding 3 as the answer. Insuff. St2...
- by Fiver
Fri Sep 17, 2010 7:10 am- Forum: Data Sufficiency
- Topic: prime numbers are factors
- Replies: 2
- Views: 1141
At least 100 students at a certain high school study Japanese. If 4 percent of the students who study French also study Japanese, do more students at the school study French than Japanese? [1] 16 students at the school study both French and Japanese. [2] 10 percent of the students at the school who...
- by Fiver
Fri Sep 17, 2010 6:58 am- Forum: Data Sufficiency
- Topic: French also study Japanese
- Replies: 2
- Views: 3112
C Agree with the above poster. St1] None of the six numbers is greater than 50. We can have contradictory possibilities here. The max value any of the 6 nos. is 50. We know that the sum of all 6 = 150 If 1 is 50, the avg. of the remaining 5 is 20. So we could have an AP of 5 nos. with 20 as the med...
- by Fiver
Tue Aug 24, 2010 9:06 am- Forum: Data Sufficiency
- Topic: knewton-average
- Replies: 2
- Views: 1081
I would have chosen E for an answer to this one. We know that the total charges are 3.75 We need to know the total hours gievn that the 1st hour parking is a fixed cost > the parking cost of subsequent hrs. St1] Parking charges at the garage are $0.75 for the first hour and $0.50 for each additional...
- by Fiver
Fri Aug 06, 2010 10:22 am- Forum: Data Sufficiency
- Topic: DS - Nan car park
- Replies: 7
- Views: 2886
Is x>y ? st1] x^2 > y Here if x <0 such that |x| > y, then the ans to the question is no. If 0<y<x then the ans to the question is yes. Insuff. St2] x - |y| > 0 this means x > |y| |y| must be = or > 0 hence x must be > 0, while y could be -ve, 0 or +ve. In all the 3 cases x must be > y. Choose B.
- by Fiver
Tue Aug 03, 2010 10:38 am- Forum: Data Sufficiency
- Topic: Inequalities and Modulus
- Replies: 2
- Views: 1440
Agree with the other posters. Is x>y ? Simple logical version- Is atleast the max 'y' greater than the min 'x'? If yes then the ans to our question is no OR Is the atleast the max 'x' greater than the min 'y'? If yes then the ans to our question is yes. Quick glance suggests that neither stmts is su...
- by Fiver
Wed Jul 28, 2010 10:35 am- Forum: Data Sufficiency
- Topic: Source: Of course
- Replies: 6
- Views: 1495
Thanks Rahul and Fiver...tis much appreciated. As an aside to other newbies following this thread.....in the short while that I've started studying for gmat, I find that it is imperative that one understands solutions in terms of your understanding and interpretation of problems and if u try and as...
- by Fiver
Mon Jul 05, 2010 6:44 am- Forum: Data Sufficiency
- Topic: MGMAT number properties
- Replies: 8
- Views: 1520
The average weigt of 3 people is 148 pounds.If none of the three weigh the same, what is the weight of the middle person? 1) The lightest person weighs 120 pounds 2) The differnce between the weights of the lightest person and the middle person is the same as the difference between the weights of t...
- by Fiver
Mon Jul 05, 2010 6:24 am- Forum: Data Sufficiency
- Topic: PR TEST-1 Math DS --Average Weight
- Replies: 6
- Views: 3088