Search found 31 matches


What are the dimensions of the viewable portion...?

https://s10.postimg.org/hsvucvu9x/Geometry_Area.jpg A framed picture is shown above. The frame, shown shaded, is 6 inches wide and forms a border of uniform width around the picture. What are the dimensions of the viewable portion of the picture? 1. The area of the shaded region is 24 square inches...

by Poisson

Sun Aug 28, 2016 10:35 am
Forum: Data Sufficiency
Topic: What are the dimensions of the viewable portion...?
Replies: 1
Views: 1582

Phil has a certain number of coins. He has 10 more dimes...

Phil has a certain number of coins in his pocket. He has 10 more dimes than nickels and 22 more quarters than dimes. If Phil has a total of $13.00 in change, how many coins does he have in total? A. 42 B. 36 C. 60 D. 72 E. 81 Could someone please show me the most efficient method to answer this ques...

by Poisson

Fri Aug 26, 2016 3:49 am
Forum: Problem Solving
Topic: Phil has a certain number of coins. He has 10 more dimes...
Replies: 4
Views: 2361

OG 2016 DS #117

If X is negative, is X < -3? My note: This is a yes/no question. X can be anything negative. 1. X^2 > 9 I took the square root of both sides and got X > +/-3 Since X is negative, the first option (X > +3) is out. Why is the second option (x > -3) wrong? Why is it not X > -3? I don't understand how t...

by Poisson

Sun Aug 21, 2016 12:14 pm
Forum: Data Sufficiency
Topic: OG 2016 DS #117
Replies: 1
Views: 679

Please help. I'm really confused with this one. Since R and S are both positive, I cross-multiplied the information in the prompt and to get "is r^2 < s^2"? For Statement 1, I tested fractions R= 0.3 and S = 0.4. I got 0.09 is not less than 0.16. When I tested whole numbers, I got 9 is less than 16....

by Poisson

Sun Aug 21, 2016 7:27 am
Forum: Data Sufficiency
Topic: OG (12th ed) DS Prob #80
Replies: 5
Views: 1143

Attached is a copy of my work. The answer is B but I got D and E using the shortcut for getting common denominators. Any help would be greatly appreciated.

by Poisson

Sun Jul 10, 2016 5:11 am
Forum: Problem Solving
Topic: Quadratic Equation - Why is this the answer?
Replies: 6
Views: 1269

Quadratic Equation - Why is this the answer?

Please see the attached picture. I don't understand why crossing the respective numerators and denominators and multiplying the denominators doesn't work for this problem. For example, I know that a/b + c/d = (ad+bc)/bd. I tried using this method but did not get the correct answer. Please help me un...

by Poisson

Sun Jul 10, 2016 5:08 am
Forum: Problem Solving
Topic: Quadratic Equation - Why is this the answer?
Replies: 6
Views: 1269

People who do regular volunteer work tend to live longer, on average, than people who do not. It has been found that “doing good,� a category that certainly includes volunteer work, releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being. Clearly, ther...

by Poisson

Mon Jul 04, 2016 7:27 am
Forum: Critical Reasoning
Topic: 2016 OG CR 30
Replies: 6
Views: 2496

Hello, I could really use some help understanding how statement 2 is sufficient. I don't understand how to get to 12. I translated the statement as: (2x/100)*(y)=24 where y is the number. I reduced 2x/100 to get x/50. But I still have the variable y. Please explain how x can be 12? Thanks so much L...

by Poisson

Fri Jul 01, 2016 7:34 am
Forum: Data Sufficiency
Topic: How much is x percent of a certain number?
Replies: 5
Views: 3384

Can someone explain what and how Sudir did what he did That is a method to calculate what highest power of a number will divide a factorial. For eg, what highest power of 2 will divide 30! So, what we do is take all powers of 2, which are small than the factorial number ( in this case 30 ) So, we h...

by Poisson

Fri Jul 01, 2016 6:28 am
Forum: Problem Solving
Topic: Product of 1 to 30
Replies: 16
Views: 9690

Start with a little algebra: a*b + a*c = a*b + c a*c = c a*c - c = 0 c * (a - 1) = 0 If this equation is true, we have c = 0 or (a - 1) = 0, i.e. a = 1. So the question becomes "Is c = 0 and/or a = 1?" From there, the statements are a snap! This is very common the GMAT, so it's a good practice to d...

by Poisson

Fri Jul 01, 2016 6:26 am
Forum: Data Sufficiency
Topic: Does a x (b + c) = a x b + c?
Replies: 5
Views: 2010

Passengers on a train

On Wednesday, a certain number of passengers board an empty train leaving Washington, DC for Boston. In Baltimore, half of the passengers exit, and 20 additional passengers board the train. In Philadelphia, one-fourth of the passengers exit, and ten more passengers board the train. How many passenge...

by Poisson

Fri Jul 01, 2016 5:35 am
Forum: Problem Solving
Topic: Passengers on a train
Replies: 4
Views: 1448

Can someone explain what and how Sudir did what he did That is a method to calculate what highest power of a number will divide a factorial. For eg, what highest power of 2 will divide 30! So, what we do is take all powers of 2, which are small than the factorial number ( in this case 30 ) So, we h...

by Poisson

Sun Jun 26, 2016 2:56 pm
Forum: Problem Solving
Topic: Product of 1 to 30
Replies: 16
Views: 9690

Does a x (b + c) = a x b + c?

Does a x (b + c) = a x b + c?

Statement 1: a = 1

Statement 2: c = 0

Please help me understand the logic behind this. Thanks so much.

by Poisson

Fri Jun 17, 2016 4:55 pm
Forum: Data Sufficiency
Topic: Does a x (b + c) = a x b + c?
Replies: 5
Views: 2010

Hello, I could really use some help understanding how statement 2 is sufficient. I don't understand how to get to 12. I translated the statement as: (2x/100)*(y)=24 where y is the number. I reduced 2x/100 to get x/50. But I still have the variable y. Please explain how x can be 12? Thanks so much

by Poisson

Sat Jun 11, 2016 2:32 pm
Forum: Data Sufficiency
Topic: How much is x percent of a certain number?
Replies: 5
Views: 3384

Hello,

I'm having a hard time following the calculations for this. Could someone share an algebraic approach to answering this question? Thanks so much

by Poisson

Sat Jun 11, 2016 6:18 am
Forum: Problem Solving
Topic: MGMAT a satellite is composed of
Replies: 3
Views: 2445