Search found 30 matches

Re: cats and dogs

Hi, You clearly made a mistake in writing the question so I will assume that the question reads "1/5 of the cats and 1/4 of the dogs". The problem here is that we do not have the ratio of dogs to cats but we know that the number of pets adopted would be higher if the ratio of dogs to cats was higher...

by Ossa

Sat Apr 25, 2009 5:46 am
Forum: Problem Solving
Topic: cats and dogs
Replies: 1
Views: 1035

Re: equilateral triangle area

Hi, The area of any triangle=1/2(base*height) The equilateral traingle can be divided into two 30, 60, 90 triangles that have a base=x, height=x.SQRT(2) and the hypotenuse=2x. Where x=1/2 the side of the big triangle. Accordingly the area=1/2 (side).(SQRT (2).side/2)=1/4 (side)^2 . SQRT(2) Hi there,...

by Ossa

Wed Apr 15, 2009 1:04 pm
Forum: GMAT Math
Topic: equilateral triangle area
Replies: 2
Views: 1159

Re: price promotions on sales

Hi Yang, You posted this in the wrong forum. Extensive research has shown that the effects of short-term price promotions on sales are themselves short-term. Companies’ hopes that promotions might have a positive aftereffect have not been borne out for reasons that researchers have been able to iden...

by Ossa

Wed Apr 15, 2009 12:46 pm
Forum: Problem Solving
Topic: price promotions on sales
Replies: 2
Views: 1909

Re: GMAT prep 1 DS question

The difference between the angles x, and y is the key as Musiq showed. The second statement is irrelevant because it does not show the relationship between the two angles, but the first statement does. Hi All, I did a search to find answer to this DS problem but failed. Please have a look and let me...

by Ossa

Mon Apr 06, 2009 3:17 pm
Forum: Data Sufficiency
Topic: GMAT prep 1 DS question
Replies: 2
Views: 898

Re: Careless/Simple/Stupid Mistakes

Sometimes you make mistakes when you take shortcuts and make calculations in your mind. If you have the time, right down the steps. You will make less obvious mistakes when you see things visually. I have been making a lot of really careless mistakes lately, and I mean really careless. Things like 5...

by Ossa

Mon Apr 06, 2009 3:04 pm
Forum: Problem Solving
Topic: Careless/Simple/Stupid Mistakes
Replies: 3
Views: 1387

Re: 20 mile course

Unless she took a break, I also think the answer is B. On a 20 mile course, Pat bicycled at an avg rate of 39 miles / h for the first 12 min and , without a break, ran the rest of the distance at an avg rat of 8 miles / h. How many minutes did Pat take to cover the entire course ? A. 75 B. 105 C. 11...

by Ossa

Wed Mar 25, 2009 6:08 am
Forum: Problem Solving
Topic: 20 mile course
Replies: 10
Views: 1235

Re: Algebra & Manufacturer

I think if you step back a second and think about this, you would be able to find the answer quickly. If we save $x per unit and lose $y/day per unit, then you need x/y days to breakeven. Remark: as a double check you can also exclude all the options with n, since both x and y are in dollars per uni...

by Ossa

Wed Mar 25, 2009 5:14 am
Forum: Problem Solving
Topic: Algebra & Manufacturer
Replies: 3
Views: 1299

Re: factor this out

Just remember that the key to this is: x^(a-b)=(x^a)/(x^b).

semidevil wrote:5^k - 5^(k-1)

how do I factor this to become:
5^k - (1/5)5^k

Is there some number properties Im missing?

this is from Eric's flashcards.

by Ossa

Wed Mar 25, 2009 5:03 am
Forum: Problem Solving
Topic: factor this out
Replies: 2
Views: 842

Re: Sequence

I also think that the best way is to estimate. Keep in mind that you have limited time to answer all the questions. By eliminating some of the clearly wrong choices, you are only dealing with the last two choices. Go ahead and read the answer posted before and let me know if you are still having tro...

by Ossa

Wed Mar 11, 2009 3:48 pm
Forum: Problem Solving
Topic: Sequence
Replies: 3
Views: 895

Another similar way

Hi, Here is another way that is very similar. If x is the hypotenuse, then the 2 sides will be equal to x/SQRT 2 then, x/(SQRT 2)+x/(SQRT 2)+x=16(1+SQRT 2) then, x(2/(SQRT 2) +1)=16(1+SQRT 2) and accordingly, x((SQRT 2 +1)=16 (1+SQRT 2), and so x=16 thanks a lot - just wondering if a quicker way (sh...

by Ossa

Fri Mar 06, 2009 6:04 am
Forum: Problem Solving
Topic: Hypoteneuse of the triangle
Replies: 7
Views: 2069

Re: Powerprep - Geometry Question


This question was posted before. Please see the following: ... 31195.html

sam78 wrote:Guys,

Would appreciate inputs to solve the attached problem.



by Ossa

Sun Mar 01, 2009 4:33 pm
Forum: Problem Solving
Topic: Powerprep - Geometry Question
Replies: 2
Views: 1061



The plane takes 9 hours to reach Toronto and so it arrives at 8:45 London time which is 3:45 pm Toronto time.

Rag_gmat wrote:IMO it is 3:45

by Ossa

Fri Feb 27, 2009 5:05 am
Forum: Problem Solving
Topic: London time
Replies: 3
Views: 1081

Re: Scale measure problem

If the reading on the scale is 4, then the intensity is 10 times the intensity of 3. If the reading is 5, then the intensity is 10 time the intensity at 4 which is equal to 100 times the intensity at 3, and so one. Accordingly the intensity at 8 is 10^5 that of 3. On a scale that measures the intens...

by Ossa

Mon Feb 23, 2009 4:35 pm
Forum: Problem Solving
Topic: Scale measure problem
Replies: 2
Views: 929

Re: Standart deviation

Just to clarify, Standard deviation is a measure of dispersion of points around a certain mean and that is why subtracting the same number from all values only shifts the mean but dispersion remains the same and so the standard deviation does not change.

4meonly wrote:OA D

by Ossa

Mon Feb 23, 2009 4:03 pm
Forum: Problem Solving
Topic: Standart deviation
Replies: 5
Views: 1056

Re: x and y

Hi, Here is an easy way: Since y is much larger than x, then the equation can be simplified to y/xy which is equal to 1/x. Accordingly the value of the equation is between 1/.02 and 1/.1, or between 50 and 10, so the answer is 15 (B). OA [spoiler]soon :-)[/spoiler]

by Ossa

Fri Feb 20, 2009 7:03 pm
Forum: Problem Solving
Topic: x and y
Replies: 3
Views: 911