Search found 106 matches


IMO B Given an area the square has the smallest perimeter and therefore it has the smallest diagonal. The side of the square is 3^1/2 since the area is 3. Diagonal = 2^(1/2) x 3^(1/2) = 6 ^(1/2) The two diagonals account for = 2 x 6 ^(1/2) I thought about it as a square too but my experience is tha...

by marcusking

Tue May 12, 2009 6:52 am
Forum: Problem Solving
Topic: Do you know a Rectangle when you see one?
Replies: 3
Views: 837

Re: Put on Your problem Solving Hat I

Two handymen, Peter and Paul, agree to paint the interior of a house and lay hardwood floor. The total area of the walls to be painted is 4000 square feet and the total floor area is 1500 square feet. In an hour of hard work, Peter can either paint 40 square feet or lay 15 square feet of hardwood w...

by marcusking

Tue May 12, 2009 6:46 am
Forum: Problem Solving
Topic: Put on Your problem Solving Hat I
Replies: 2
Views: 1131

Re: Do you know a Rectangle when you see one?

Among all rectangles of area 3, what is the smallest possible value of the sum of the lengths of its diagonals? a. √8 b. 2√6 c. 2√10 d. 8 e. 10 Lets take a rectangle with sides 1 & 3 the diagonal must be equal to sqrt(1^2 + 3^2) or sqrt(10) since it's asking for the sum of the dia...

by marcusking

Tue May 12, 2009 6:38 am
Forum: Problem Solving
Topic: Do you know a Rectangle when you see one?
Replies: 3
Views: 837

Re: Number problem

a two digit number is obtained either by multiplying the sum of the digits by 8 and subtracting 2 or by multiplying the difference of the digits by 15 and adding 2. find the number ans is 62 . do let me know how you solve this problem Lets start by taking the 2 digit multiples of 8 and subtracting ...

by marcusking

Mon May 11, 2009 11:05 am
Forum: Problem Solving
Topic: Number problem
Replies: 2
Views: 788

if x dollars are invested at 10 percent for one year and y dollars are invested at 8% for one year, the annual income from the 10% will exceed the annual income from 8% in 56 dollars. if the total invested was 2000, how much was invested in both of them? ====================== PTR/100 - ptr/100 = 5...

by marcusking

Fri May 01, 2009 12:02 pm
Forum: Problem Solving
Topic: dollar invested
Replies: 6
Views: 1023

Re: notebook and pencil-- inequality

If 20 Swiss Francs is enough to buy 9 notebooks and 3 pencils, is 40 Swiss Francs enough to buy 12 notebooks and 12 pencils? (1) 20 Swiss Francs is enough to buy 7 notebooks and 5 pencils. (2) 20 Swiss Francs is enough to buy 4 notebooks and 8 pencils. OA : B Please explain, thank source: Gmat-math...

by marcusking

Fri May 01, 2009 4:51 am
Forum: Data Sufficiency
Topic: notebook and pencil-- inequality
Replies: 16
Views: 3915

1. not sufficient --> we cannot use given arc lenght because it might vary for different angles 2. not sufficient -- > not sufficient data given to compute cir. Both 1 & 2 sufficient -- > If r=s, then it becomes an equilateral triangle and we can make another similar equilateral triangle with XYZ. ...

by marcusking

Fri May 01, 2009 4:38 am
Forum: Data Sufficiency
Topic: Geometry problem - Curcumference of a circle
Replies: 7
Views: 1537

mike22629 wrote:Lol didnt turn out well.

To explain it:

Imagine two 45/45/90 triangles on opposite sides of a square facing the opposite direction. That was the shape I was trying to illustrate.
Thanks for trying. I think I finally was able to envision what it would look like
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|@\
|@@|
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by marcusking

Thu Apr 30, 2009 8:54 am
Forum: Data Sufficiency
Topic: MGMAT - parallelogram
Replies: 3
Views: 964

MGMAT - parallelogram

In the quadrilateral PQRS, side PS is parallel to side QR. Is PQRS a parallelogram? (1) PS = QR (2) PQ = RS OA is A but I think it should be D. If we know that PS || QR then if PQ = RS shouldn't PQ || RS also? I've tried to sketch it to get it to be wrong but I can't come up with any situation where...

by marcusking

Thu Apr 30, 2009 8:16 am
Forum: Data Sufficiency
Topic: MGMAT - parallelogram
Replies: 3
Views: 964

Re: Algebra question

Can anybody tell me how to solve this; If xy + z = x(y + z), which of the following must be true? a) x = 0 and z = 0 b) x = 1 and y = 1 c) y = 1 and z = 0 d) x = 1 and y =0 e) x = 1 and z = 0 The answer is E, I solved for x and got one, however, I'm uncertain on how the answer is z = 0 and not y = ...

by marcusking

Thu Apr 30, 2009 5:46 am
Forum: Problem Solving
Topic: Algebra question
Replies: 4
Views: 860

Re: Concentrations Confusion

Hi, I'm trying to brush up on my "concentration/ mixture" type questions and have come across a problem which I can not solve. It relates to two similar questions: 1. One gallon of soft drink is made of 40% orange juice and 60% water, how many additional gallons of orange juice must be mixed in to ...

by marcusking

Thu Apr 30, 2009 5:38 am
Forum: Problem Solving
Topic: Concentrations Confusion
Replies: 2
Views: 1129

Re: Why to divide by 2?

How many different pairs can be selected from a group of 7 people? The answer is 21? I just can't understand why to divide at the 2 at th end?! Thank you Why, or rather what says to divide by 2 at the end? Just write out the numbers 1 to 7 and start pairing them together It should be quick enough a...

by marcusking

Thu Apr 30, 2009 5:16 am
Forum: Problem Solving
Topic: Why to divide by 2?
Replies: 4
Views: 3563

Let’s say there are 12 cookies. ¼ are in the blue tin. So the blue tin has 3. 1/3 are in the red tin. So the red tin has 4. 2/3 – 1/4 = 5/12 are in the green tin. So 5/12 * 12 = 5. Blue = 3 Red = 4 Green = 5 Now, what fraction of the cookies that were placed in the green or red tins were placed in ...

by marcusking

Wed Apr 29, 2009 8:42 am
Forum: Problem Solving
Topic: A BATCH OF COOKIES
Replies: 8
Views: 3821

Re: The World Wildlife fund (possesive!)

OG v12 The World Wildlife Fund has declared that global warming, a phenomenon most scientists agree to be caused by human beings in burning fossil fuels, will create havoc among migratory birds by altering the environment in ways harmful to their habitats. (a) a phenomenon most scientists agree to ...

by marcusking

Wed Apr 08, 2009 7:15 am
Forum: Sentence Correction
Topic: The World Wildlife fund (possesive!)
Replies: 8
Views: 3169

Re: DS Powerprep question

Hello, I've just started studying for the GMAT so I'm sure I will have a ton of questions. Thank you in advance for your help. What is the value of the two-digit integer x? 1. The sum of the two-digits is 3 2. x is divisible by 3 The answer is E. I don't understand why the answer is not C (they sha...

by marcusking

Tue Apr 07, 2009 9:08 am
Forum: Data Sufficiency
Topic: DS Powerprep question
Replies: 3
Views: 1026