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e also.. because if z is a negative.... (x+y) > 0 but x could be a negative or a positive depends on the value of x which is unknown Its C in the book. They explain that if z<0 then it means x+y must be less than 0 to make a number that is positive. I just dont understand how x<y would give you x+y...
- by phoenixhazard
Tue Oct 26, 2010 12:46 pm- Forum: Data Sufficiency
- Topic: If (x+y)/z < 0, is x <0? (1) x<y (2)z<0
- Replies: 18
- Views: 6003
If (x+y)/z < 0, is x <0? (1) x<y (2)z<0
This is from official GMAC book.
If (x+y)/z < 0, is x <0?
(1) x<y
(2)z<0
I have the explanation from the book but it doesn't make sense to me. The OA is C. Can you please explain to me in your own words, perhaps that will clarify it.
- by phoenixhazard
Tue Oct 26, 2010 11:18 am- Forum: Data Sufficiency
- Topic: If (x+y)/z < 0, is x <0? (1) x<y (2)z<0
- Replies: 18
- Views: 6003
If you square a number, any number, the result has to be a positive number or 0. 0^2 = 0 5^2 = 25 (1/5)^2 = 1/25 So forth... (2) says that m x n is less than 0. This statement means that m cannot be equal to n for the reason I have listed above. If m is equal to n, then mn must be 0 or a positive n...
- by phoenixhazard
Tue Oct 26, 2010 6:45 am- Forum: Data Sufficiency
- Topic: Is m not equal to n? (1) m+n <0 (2) mn<0
- Replies: 6
- Views: 4550
A right circular cone is inscribed in a hemisphere so that the base of the cone coincides with the base of the hemisphere. What is the ratio of the height of the cone to the radius of the hemisphere? So the answer states its 1:1, which only makes sense if you know that the height of the one is exac...
- by phoenixhazard
Mon Oct 25, 2010 10:49 am- Forum: Problem Solving
- Topic: Right circular cone question?
- Replies: 6
- Views: 3198
Right circular cone question?
A right circular cone is inscribed in a hemisphere so that the base of the cone coincides with the base of the hemisphere. What is the ratio of the height of the cone to the radius of the hemisphere? So the answer states its 1:1, which only makes sense if you know that the height of the one is exact...
- by phoenixhazard
Sun Oct 24, 2010 1:17 pm- Forum: Problem Solving
- Topic: Right circular cone question?
- Replies: 6
- Views: 3198
phoenixhazard, Correct! The question is asking: "Is m not equal to n?" There isn't any set of numbers where m is equal to n, and mn < 0. With this information, we can answer the question as "NO," hence B is sufficient. Sorry maybe I'm just being dumb but I still don't understand...
- by phoenixhazard
Wed Oct 20, 2010 9:52 am- Forum: Data Sufficiency
- Topic: Is m not equal to n? (1) m+n <0 (2) mn<0
- Replies: 6
- Views: 4550
If x is an integer, is (x^2 +1) (x+5) an even number? (1) x is an odd number (2) Each prime factor of x^2 is greater than 7 OA = Each statement ALONE is sufficient spoiler to answer: (my question) I understand (1), that definitely gives you always an odd number with the formula. Not sure how (2) wo...
- by phoenixhazard
Tue Oct 19, 2010 8:46 pm- Forum: Data Sufficiency
- Topic: If x is an integer, is (x^2 +1) (x+5) an even number?
- Replies: 9
- Views: 7149
Is m not equal to n? (1) m+n <0 (2) mn<0 I can't figure this out for the life of me. If they are asking if m and n will be positive/negative I can see that but I can't see how those 2 statements can tell you if the numbers will be the same. btw the OA is Statement (2) ALONE is sufficient, but state...
- by phoenixhazard
Tue Oct 19, 2010 7:13 pm- Forum: Data Sufficiency
- Topic: Is m not equal to n? (1) m+n <0 (2) mn<0
- Replies: 6
- Views: 4550
If x is an integer, is (x^2 +1) (x+5) an even number?
If x is an integer, is (x^2 +1) (x+5) an even number? (1) x is an odd number (2) Each prime factor of x^2 is greater than 7 OA = Each statement ALONE is sufficient spoiler to answer: (my question) I understand (1), that definitely gives you always an odd number with the formula. Not sure how (2) wor...
- by phoenixhazard
Tue Oct 19, 2010 7:10 pm- Forum: Data Sufficiency
- Topic: If x is an integer, is (x^2 +1) (x+5) an even number?
- Replies: 9
- Views: 7149
Is m not equal to n? (1) m+n <0 (2) mn<0
Is m not equal to n? (1) m+n <0 (2) mn<0 I can't figure this out for the life of me. If they are asking if m and n will be positive/negative I can see that but I can't see how those 2 statements can tell you if the numbers will be the same. btw the OA is Statement (2) ALONE is sufficient, but statem...
- by phoenixhazard
Tue Oct 19, 2010 6:28 pm- Forum: Data Sufficiency
- Topic: Is m not equal to n? (1) m+n <0 (2) mn<0
- Replies: 6
- Views: 4550
bump
Seems to me that when you get 81 that is that m = 81. So you would use |m| = 3m which i feel wouldn't you plug in to m? why do u plugin to |m| instead?
- by phoenixhazard
Tue Oct 19, 2010 6:05 pm- Forum: Problem Solving
- Topic: GMATPrep box "m" question.
- Replies: 8
- Views: 2601
How many positive integers are less than 10,000 in which the sum of the digits is equals 5? A. 31 B. 51 C. 56 D. 62 E. 93 I got started on this, but could only try to count up the ways manually. There must be a trick. Please help! OA. is C. From Ready for GMAT.com Advanced Quant download. Here is a...
- by phoenixhazard
Tue Oct 19, 2010 2:15 pm- Forum: Problem Solving
- Topic: Positive Integers Less than 10,000 --> Not Easy
- Replies: 15
- Views: 5462
Agreedvishalj wrote:IMO B
Appositive is appropriate here. The relative clause "which" is modifying "interest rate", which is incorrect.
- by phoenixhazard
Mon Oct 18, 2010 6:34 pm- Forum: Sentence Correction
- Topic: Federal Reserve
- Replies: 6
- Views: 2273
In Rwanda, the chance for rain on any given day is 50%. What is the probability that it rains on 4 out of 7 consecutive days in Rwanda? a) 4/7 b) 3/7 c) 35/128 d) 4/28 e) 28/135 Good one.... 4 days can be picked from 7 days in 7c4 ways = 35 possible ways. On a single selection, probability of raini...
- by phoenixhazard
Mon Oct 18, 2010 1:51 pm- Forum: Problem Solving
- Topic: In Rwanda, the chance for rain
- Replies: 7
- Views: 5072
If 2^x - 2^(x-2) = 3(2^13), what is the value of x? a) 9 b) 11 c) 13 d) 15 e) 17 We can plug in the answer choices for x. Answer choice C: x= 13 2^13 - 2^(13-2) = 3(2^13) 2^13 - 2^11 = 3(2^13) 2^11(2^2 - 1) = 3(2^13) 2^11(3) = 3(2^13) Plugging in x=13 made the exponent on the left 2^11. To match 2^...
- by phoenixhazard
Mon Oct 18, 2010 1:29 pm- Forum: Problem Solving
- Topic: 2^x - 2 ^ (x-2) = 3(2 ^ 13) , what is x?
- Replies: 5
- Views: 7452