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GMAT Experts, Shouldn't the answer for attached question be pi*S(2R + S)? Can you please confirm the same.Thanks. Radius of medallion = r Radius of glass interior = r-s Area = pi * (r^2 -(r-s)^2) = pi * ( (r+r-s)(r-r+s)) = pi * (2r-s)(s) . ( using a^2-b^2 = (a+b)(a-b) ) E is correct.
- by eagleeye
Thu Aug 09, 2012 8:05 pm- Forum: GMAT Math
- Topic: Geometry GMAT Prep question- Experts plz confirm ans.
- Replies: 3
- Views: 1529
Thanks eagleeye. While solving question just thought that 90 + 90 + 2x + x= 360 and Thus x=60 and hence chose option C as answer. Didn't think about the combination of angles can be 90, 45, 135, 90 that also satisfies both the conditions. How did you think about that ? Can you plz give some tips th...
- by eagleeye
Thu Aug 09, 2012 7:53 pm- Forum: Data Sufficiency
- Topic: GMAT Prep DI question- Experts please reply ASAP
- Replies: 3
- Views: 834
Is the degree measure of one of the angles of quadrilateral ABCD equal to 60 degree ? 1. Two of the Interior angels of ABCD are Right angles 2. The degree measure of angle ABC is twice the degree measure of angle BCD Can you please confirm the answer. We have quadrilateral ABCD. We need to find if ...
- by eagleeye
Thu Aug 09, 2012 7:34 pm- Forum: Data Sufficiency
- Topic: GMAT Prep DI question- Experts please reply ASAP
- Replies: 3
- Views: 834
If the prime numbers p and t are the only prime factors of the integer m, is m a mutiple of (p^2)*t 1. m has more than 9 positive factors 2. m is a mutiple of p^3 Can you please confirm the answer. B is correct. We are told that m has p and t as the only prime factors. This means that all factors o...
- by eagleeye
Thu Aug 09, 2012 7:21 pm- Forum: Data Sufficiency
- Topic: GMAT Prep Number Theory question- Experts please reply ASAP
- Replies: 2
- Views: 817
Hello, I guess this treat has been inactive for a while,,, I have used the Assumption Negation Technique for all Assumption questions and I feel that it works well (please suggest if this method is appropiate) ,,, but I really do not understand how the argument does not fall apart when we negate an...
- by eagleeye
Wed Aug 08, 2012 9:08 pm- Forum: Critical Reasoning
- Topic: Powerscore Question - Art Historian
- Replies: 19
- Views: 6026
A car traveled a distance of d miles in t minutes at an average rate of r miles per minute. What is the ratio of d to r ? (1) t = 30 (2) d = 25 Speed = distance/time => r = d/t => t = d/r. Hence if we can find t, we have d/r. (1) t = 30 This tells us t. Sufficient. (2) d = 25 We don't know t insuff...
- by eagleeye
Wed Aug 08, 2012 1:54 pm- Forum: Data Sufficiency
- Topic: d/r?
- Replies: 1
- Views: 1023
If b is the product of three consecutive positive integers c, c + 1, and c + 2, is b a multiple of 24 ? (1) b is a multiple of 3, (2) c is odd. For both statements, separately and combined, try the following same 2 cases: b = 3*4*5. (not multiple of 24) b = 15*16*17 ( multiple of 24) You will get t...
- by eagleeye
Wed Aug 08, 2012 1:48 pm- Forum: Data Sufficiency
- Topic: b a multiple of 24?
- Replies: 2
- Views: 1107
In the figure below, if AC=12, DC=18, and DB=15, what is the length of AF? A)8 B)9 C)10 D)11 E)12 Figure reference: http://24.media.tumblr.com/tumblr_m8gfpziNTe1rd5jmyo1_1280.jpg Hi arifaisal: The quick way to do this is to recognize that the two right angled triangles :- AFC and BDC are similar. H...
- by eagleeye
Wed Aug 08, 2012 1:19 pm- Forum: Problem Solving
- Topic: geometry helppppp
- Replies: 2
- Views: 2352
Grocery store's profit equals sales minus the cost and taxes. By what percent did the grocery store's profit changed on July 25,2005 When sales, cost, and taxes all increased? (1) Grocery store's sales increased by 5 percent on july 25,2005. (2) Grocery store's cost and taxes increased by 25 percen...
I guess it's unclear to me what you meant by P = P(Head)*P(Anything head or tail) Why do you feel that P(at least one head) = P(Head)*P(Anything head or tail)? I guess if we can better understand your rationale for this equation, we can get to the heart of the conceptual problem. Cheers, Brent sure...
- by eagleeye
Tue Aug 07, 2012 6:11 pm- Forum: Problem Solving
- Topic: Probability - conceptual problem
- Replies: 7
- Views: 1850
If there were 3 different colors -- red, white and green, then would P(one of each color) be 3!*P(WRG) ? Yes. You are right. It will be multiplied by 3!. For example, let's make up a question where we have 5 White, 4 Red, and 3 Green marbles. We are asked the probability that if a player picks thre...
- by eagleeye
Tue Aug 07, 2012 10:30 am- Forum: Data Sufficiency
- Topic: Red and White Marbles
- Replies: 7
- Views: 1761
Alicia purchases three different rings that can each be worn on any of her fingers, excluding her thumbs. If she wants to wear at least one ring on each hand, with no more than one ring per finger, how many different ways can she distribute the rings among her eight fingers? A. 192 B. 288 C. 336 D....
- by eagleeye
Mon Aug 06, 2012 10:04 am- Forum: Problem Solving
- Topic: 3 Rings
- Replies: 8
- Views: 2065
Since RW can be reversed to WR, we multiply by 2 Probability of one red, one white = q = 2! * 8/(8+y) * y/(8+y-1) Here the order in which we take 2 marbles is not important, so why do we have to multiply by 2?? When you do a probability calculation, it doesn't matter whether the order is considered...
- by eagleeye
Sun Aug 05, 2012 10:05 pm- Forum: Data Sufficiency
- Topic: Red and White Marbles
- Replies: 7
- Views: 1761
After completing the GMAT Prep Now video sessions, I am happy to report that I scored a 640 on my practice test today. This is great, considering my first (and only so far) attempt at the GMAT (before the GMAT Prep Now videos) yielded a 430. There were two math problems in particular that didn't se...
- by eagleeye
Sun Aug 05, 2012 5:42 pm- Forum: Problem Solving
- Topic: 1 of 2 that got away
- Replies: 4
- Views: 1072
Yes.topspin360 wrote:this is brilliant. is that how you usually tackle x<y or x>y questions? by looking at whether x-y is + or -?
- by eagleeye
Sun Aug 05, 2012 11:25 am- Forum: Data Sufficiency
- Topic: negative numbers equations..
- Replies: 7
- Views: 3042