Search found 90 matches
Sequence of positive numbers
Dear all,
could someone kindly explain how to get to the OA (which is C).
Thanks in advance
- by Baldini
Tue Apr 07, 2009 6:01 am- Forum: Data Sufficiency
- Topic: Sequence of positive numbers
- Replies: 3
- Views: 1172
GMAT Prep integer question (r and s)
If r and s are positive integers, is r/s an integer?
1. Every factor of s is also a factor of r
2. Every prime factor of s is also a factor of r
OA is A .
Can someone please explain why, especially with reference to the second statement?
thanks in advance
- by Baldini
Tue Apr 07, 2009 5:37 am- Forum: Data Sufficiency
- Topic: GMAT Prep integer question (r and s)
- Replies: 1
- Views: 1243
another way of solving this?
Would this be a possible way of solving the problem (or is it just fluke). 32 people speak no Russian. Total = FR + RU + Neither - FR&RU Therefore RU = FR + Neither We know that 20 speak French and we know that 10% of the Total speak Neither thus: RU = FR + Neither 32 = 20 + 0.1T 12=0.1T T=120 t...
- by Baldini
Fri Apr 03, 2009 6:09 am- Forum: Problem Solving
- Topic: double matrix charts
- Replies: 11
- Views: 2680
GMAT Prep question: with absolute value
Is sqrt((x-5)^2) = 5 - x?
1. -x|x|>0
2. 5-x>0
OA is D .
Can someone please explain how to get to this answer?
Thanks
- by Baldini
Thu Apr 02, 2009 10:23 am- Forum: Data Sufficiency
- Topic: GMAT Prep question: with absolute value
- Replies: 2
- Views: 1414
Average height
What is the average height (arithmetic mean) of the n people in a certain group? 1. The average height of the n/3 tallest people in the group is 6 feet and 2.5 inches and the average height of the rest of the group is 5 feet 10 inches 2. the sum of the heights of the n people is 178 feet and 9 inche...
- by Baldini
Thu Apr 02, 2009 7:52 am- Forum: Data Sufficiency
- Topic: Average height
- Replies: 2
- Views: 2336
Operations question
Dear all, could someone please explain why the answer is [spoiler] A?[/spoiler]. I followed the following logic, but can't see where i'm going wrong: [spoiler] 1. (5+6)+2=5+(6+2) possibility is + (addition) (5*6)*2=5*(6*2) possibility is * (multiplication) It can not be division or subtraction. INSU...
- by Baldini
Wed Apr 01, 2009 2:52 am- Forum: Data Sufficiency
- Topic: Operations question
- Replies: 2
- Views: 904
m ,r, x, y
If m, r, x and y are positive, is the ratio of m to r equal to the ratio of x to y?
1. The ratio of m to y is equal to x to r
2. The ratio of m + x to r + y is equal to the ratio of x + y
OA is B .
Can someone please explain how to get to this answer?
Thanks
- by Baldini
Sun Mar 29, 2009 11:44 pm- Forum: Data Sufficiency
- Topic: m ,r, x, y
- Replies: 3
- Views: 1927
x multiple of y
If x and y are integers greater than 1, is x a multiple of y?
1. 3y^2 + 7y = x
2. x^2 – x is a multiple of y
Can someone please explain why the OA is A and not D?
Many thanks in advance
- by Baldini
Sun Mar 29, 2009 11:06 pm- Forum: Data Sufficiency
- Topic: x multiple of y
- Replies: 1
- Views: 1221
Consecutive integers
List K consists of 12 consecutive integers. If -4 is the least integer in list k, what is the range of positive integers in list k?
1. 5
2. 6
3. 7
4. 8
5. 9
OA is B. Can someone please explain (I got OA C )
- by Baldini
Sun Mar 29, 2009 11:05 pm- Forum: Problem Solving
- Topic: Consecutive integers
- Replies: 1
- Views: 3893
GMAT prep function problem
For which of the following functions f is f(x) = f(1-x) for all x?
1. f(x) = 1-x
2. f(x) = 1-x^2
3. f(x) = x^2-(1-x)^2
4. f(x) = (x^2)(1-x)^2
5. f(x) = x/(1-x)
OA is D
Can someone please explain what the question is asking for and methodology to solution?
Thanks
- by Baldini
Sun Mar 29, 2009 11:03 pm- Forum: Problem Solving
- Topic: GMAT prep function problem
- Replies: 2
- Views: 1226
- by Baldini
Fri Mar 27, 2009 3:16 am- Forum: Problem Solving
- Topic: Distance on the number line
- Replies: 4
- Views: 1435
remainder
The remainder is 57 when a number is divided by 10,000. What is the remainder when the same number is divided by 1,000?
a. 5
b. 7
c. 43
d. 57
e. 570
OA is d.
Please can someone explain how to work this out?
thanks
- by Baldini
Tue Mar 17, 2009 4:13 am- Forum: Problem Solving
- Topic: remainder
- Replies: 1
- Views: 1092
Factoring as a potential method?
Hi, came across this question: If a^3 + a^2 - a - 1 = 0, then a = a. 0 b. 1 c. 2 d. 3 e. 4 OA is B . I know that one can find the answer out easily by plugging in the list of answers, but would it also be possible to find out the answer by factoring the equation, and how would one do it? thanks in a...
- by Baldini
Tue Mar 17, 2009 1:23 am- Forum: Problem Solving
- Topic: Factoring as a potential method?
- Replies: 3
- Views: 1242
XY plane
In the xy plane, does the line with equation y=3x +2 contain the point r,s?
(1) (3r + 2 - s)(4r + 9 - s) = 0
(2) (4r - 6 - s)(3r + 2 - s)= 0
Could someone please explain the meaning of the question as well as the OA (C).
thanks in advance
- by Baldini
Sat Mar 14, 2009 12:59 am- Forum: Data Sufficiency
- Topic: XY plane
- Replies: 1
- Views: 1111
GMAT prep integer question
If the integer n is greater than 1, is n equal to 2?
(1) n has exactly two positive factors
(2) The difference of any two positive factors of n is odd
Can someone please explain why the OA is B?
Thanks
- by Baldini
Sat Mar 14, 2009 12:32 am- Forum: Data Sufficiency
- Topic: GMAT prep integer question
- Replies: 2
- Views: 1105