Search found 866 matches
Hi tonebeeze! So, first step is to correct the error in the question - it should read as follows: In the xy-plane, at what two points does the graph of y = (x +a) (x + b) intersect the x-axis? 1. a + b = -1 2. The graph intersects the y-axis at (0, -6 ) I am very puzzled by equation. As i know this...
- by goyalsau
Tue Jan 04, 2011 5:56 am- Forum: Data Sufficiency
- Topic: Gmat Prep Coordinate Geometry DS
- Replies: 12
- Views: 1813
Hi tonebeeze! So, first step is to correct the error in the question - it should read as follows: In the xy-plane, at what two points does the graph of y = (x +a) (x + b) intersect the x-axis? 1. a + b = -1 2. The graph intersects the y-axis at (0, -6 ) I am very puzzled by equation. As i know this...
- by goyalsau
Tue Jan 04, 2011 3:14 am- Forum: Data Sufficiency
- Topic: Gmat Prep Coordinate Geometry DS
- Replies: 12
- Views: 1813
It looks like a real Gmat question. What's the source?/milanproda wrote:Q is a set of integers and 11 is in Q. Let q (small q) denote any element in the Q set. Is every positive multiple of 11 in Q?
1 q+11 is in Q
2 q-11 is in Q
: : : : : : :
- by goyalsau
Tue Jan 04, 2011 2:51 am- Forum: Data Sufficiency
- Topic: Set integer/multiple of Q
- Replies: 27
- Views: 13178
What is the most efficient way of solving the below problem? Please provide step by step solution. Just to clarify, the ^ (caret) implies "to the power of". Thanks in advance. Is A^B > B^A? (1) A^A > A^B (2) B^A > B^B We can not take negative fractions for A & B , Because Then it will...
- by goyalsau
Mon Jan 03, 2011 6:03 am- Forum: Data Sufficiency
- Topic: DS - Inequalities
- Replies: 2
- Views: 1018
thanks Ron..lunarpower wrote:um ... what's the source of the problem?
because this statementis impossible.Every factor of x is even
the number 1, which is odd, is a factor of EVERY positive integer; therefore, it's impossible for "every factor of x" to be even.
sketchy sketchy...
- by goyalsau
Sun Jan 02, 2011 11:28 pm- Forum: Data Sufficiency
- Topic: Number Property
- Replies: 7
- Views: 1563
Is A positive? 1) x^2-2x+A is positive for all x 2) Ax^+1 is positive for all x ... I assume it is Ax^2 + 1 Statement 1: (x² - 2x + A) > 0 for all x. => (x² - 2x + 1 + A - 1) > 0 => (x - 1)² + (A - 1) > 0 => (A - 1) > 0 ...................... As (x - 1)² ≥ 0 for all x => A > 1 => A is positiv...
- by goyalsau
Sat Jan 01, 2011 10:23 am- Forum: Data Sufficiency
- Topic: GMATclub Number properties
- Replies: 10
- Views: 1351
If x is an integer greater than 1, is x equal to 2^k for some positive integer k? (1) x has only one prime factor. (2) Every factor of x is even. I still don't understand this. How is it B? All statement 2 says is X is 2 to the something. Whether X =2^k depends on what K is. It could and it couldnt...
- by goyalsau
Fri Dec 31, 2010 9:27 pm- Forum: Data Sufficiency
- Topic: Number Property
- Replies: 7
- Views: 1563
Profit Percentage.
Gautam has different brands of Laptop in his show room. They are Acer, IBM, Compaq and Toshiba. Gautam found that he has sold Acer & Compaq at same selling price. He made 12% profit in Acer but suffered 10% loss in Compaq. If the total cost price of Acer & Compaq is Rs.84000, find how much m...
- by goyalsau
Thu Dec 30, 2010 12:05 am- Forum: Problem Solving
- Topic: Profit Percentage.
- Replies: 2
- Views: 1115
I was not able to calculate values for x , y and z. x + z = 168 , and y = 105 , But what about the individual vales of x and z, Can we calculate that?????????? No, as we have two equations in three unknowns. I asked for the value of x and y and z , Because of this problem. http://www.beatthegmat.co...
- by goyalsau
Tue Dec 28, 2010 2:34 am- Forum: Problem Solving
- Topic: Hill Top A
- Replies: 5
- Views: 2494
A person starts from hill top A, goes downhill, then along a plain and finally climbs to hill top B. He takes a total of 4 hours for the jouney travelling downhill @72kmph, on plains @63kmph and uphill @56kmph. However while returning back, from B to A, he takes 4 hours 40 mins with speeds being sa...
- by goyalsau
Tue Dec 28, 2010 2:17 am- Forum: Problem Solving
- Topic: Hill Top A
- Replies: 5
- Views: 2494
Hill Top A
A person starts from hill top A, goes downhill, then along a plain and finally climbs to hill top B. He takes a total of 4 hours for the jouney travelling downhill @72kmph, on plains @63kmph and uphill @56kmph. However while returning back, from B to A, he takes 4 hours 40 mins with speeds being sam...
- by goyalsau
Mon Dec 27, 2010 11:02 pm- Forum: Problem Solving
- Topic: Hill Top A
- Replies: 5
- Views: 2494
For any two distinct numbers x and y : (x-y)^2 > 0 => x^2 + y^2 > 2xy So, statement 2 : (x+y)^2 > 200 => x^2+y^2+2xy > 200 => 2(x^2+y^2) > 200 => x^2 + y^2 > 100 So it is sufficient . Hope that makes it clear. If (x^2+y^2)+2xy > 200 and since x^2+y^2 > 2xy Then (x^2+y^2)+(x^2+y^2) > 200 {You are ad...
- by goyalsau
Mon Dec 27, 2010 11:51 am- Forum: Data Sufficiency
- Topic: DS Question # 1 - X^2 + Y^2?
- Replies: 11
- Views: 2959
Why is 2 sufficient ? Here is how easy it is : For any two distinct numbers x and y : (x-y)^2 > 0 => x^2 + y^2 > 2xy So, statement 2 : (x+y)^2 > 200 => x^2+y^2+2xy > 200 ( Where you 2xy gone in the nest step) => 2(x^2+y^2) > 200 => x^2 + y^2 > 100 So it is sufficient . Hope that makes it clear.
- by goyalsau
Mon Dec 27, 2010 10:30 am- Forum: Data Sufficiency
- Topic: DS Question # 1 - X^2 + Y^2?
- Replies: 11
- Views: 2959
Hi goyalsau! Thank you for your interest in my solution!! if the sum of digits is divisible by 27, Then Number is divisible by 27, If its not then the number is not divisible by 27, You can use that for 3 and also for 9, but not for 27... (counter-) example: 1899 is not divisibly by 27 but the sum ...
- by goyalsau
Mon Dec 27, 2010 10:01 am- Forum: Problem Solving
- Topic: N = 121212
- Replies: 9
- Views: 5191
Let N = 121212... up to 300 digits. What is the remainder when N is divided by 999? 12 121 216 666 Let me write the given 300 digit number as follows: 1212 ... 121212 = 1212 ... 121*1000 + 212 = 1212 ... 2121*(999 + 1) + 212 = 1212 ... 2121*999 + 1212 ... 2121 + 212 = 999*(Something) + 1212 ... 233...
- by goyalsau
Mon Dec 27, 2010 9:49 am- Forum: Problem Solving
- Topic: N = 121212
- Replies: 9
- Views: 5191