Search found 18 matches
Three questions please help
Could someone please explain how to solve these problems. Thanks Question 1: If 3^6x = 8,100, what is the value of (3^(x – 1))^3 ? A. 90 B. 30 C. 10 D. 10/3 E. 10/9 D Question 2 On an aerial photograph, the surface of a pond appears as circular region of radius 167 inch. If a distance of 1 inch on t...
- by jba05d
Mon Aug 03, 2009 9:46 am- Forum: Problem Solving
- Topic: Three questions please help
- Replies: 7
- Views: 2740
Thanks. I started to do that on the test, but I felt that it took to long. Does anyone know a faster methodology, or is that way simply the fastest.
- by jba05d
Sat Aug 01, 2009 4:24 pm- Forum: Problem Solving
- Topic: Ratio Problems
- Replies: 4
- Views: 1665
Ratio Problems
Can someone please explain how to solve this problem. I guessed correctly on a practice GMAT, but I am not exactly sure how to solve the problem. Q24: Four staff members at a certain company worked on a project. The amounts of time that the four staff members worked on the project were in the ratio ...
- by jba05d
Sat Aug 01, 2009 2:20 pm- Forum: Problem Solving
- Topic: Ratio Problems
- Replies: 4
- Views: 1665
As long as the pronoun "which" clearly refers to an antecedent noun than it does not exactly matter what word is directly before the comma. In this case, "which" clearly refers to the noun letters. It does not refer to Susan Huntington because she is a person. Therefore, the pron...
- by jba05d
Mon Jul 20, 2009 5:40 pm- Forum: Sentence Correction
- Topic: Emily Dickinson
- Replies: 10
- Views: 19622
The word merger usually implies that two things are being merged together. Therefore, the correct usage must be in the form of the merger of X and Y. The sentence is ambiguous in this sense because the nation's leading gas and electric company could be interpreted as one entity. Also, "with&quo...
- by jba05d
Mon Jul 20, 2009 5:14 pm- Forum: Sentence Correction
- Topic: gas and electric industries
- Replies: 3
- Views: 3511
shibal, Think of the equations this way: a + b = 5/6 a + c = 2/3 b + c = 1/2 where, a, b, and c represent the work rates of a, b, and c. a + b + a + c + b + c = 5/6 + 2/3 + 1/2 2a + 2b + 2c = 5/6 + 4/6 + 3/6 2a + 2b + 2c = 12/6 2a + 2b + 2c = 2 This above equation tells us that it takes 2 of each of...
- by jba05d
Sun Jul 19, 2009 7:21 pm- Forum: Problem Solving
- Topic: water filling
- Replies: 7
- Views: 1296
When you use the weighted average method you must weight by time instead of by distance. Therefore, the correct weighted average formula is as follows: 30mph*(1.0hrs/1.5hrs) + 60mph*(0.5hrs/1.5hrs) = X Solving for x, 30mph*(2/3hrs) + 60mph*(1/3hrs) = 20mph + 20mph = 40mph Therefore, the correct answ...
- by jba05d
Sat Jul 04, 2009 2:12 pm- Forum: Problem Solving
- Topic: GMATPrep: average speed
- Replies: 7
- Views: 2154
You must reflect the additional 10 stamps that Alberta received from Kayne in the denominator of your ratio. The correct formula is as follows (5x - 10)/(3x + 10) = 7/5 Solving for x, 25X - 50 = 21x + 70 4x = 12- x = 30 Therefore, Kayne originally had 150 stamps and now, after giving 10 stamps to Al...
- by jba05d
Sat Jul 04, 2009 1:20 pm- Forum: Problem Solving
- Topic: ratio of stamps
- Replies: 7
- Views: 3470
DanaJ
I obtained the same answer as you did. I believe 5 is the correct number. Out methodology was completely the same.
- by jba05d
Mon Jun 29, 2009 6:40 pm- Forum: Problem Solving
- Topic: Word Problem help please
- Replies: 3
- Views: 2269
I think the fastest way to solve this problem is to realize that the sequence moves in larger steps of multiples of 11. Therefore, to discover if the number 643 is in the sequence simply take that number and subtract the first number in the sequence (i.e. 39) from 643. This will leave 604. If 604 is...
- by jba05d
Wed Jun 10, 2009 7:58 am- Forum: GMAT Math
- Topic: Interesting sequence
- Replies: 7
- Views: 1693
Pathaniaus and Svedankae, When working with consecutive series problems (such as this one) there are a couple of important concepts that you should memorize. Firstly, in any sequence of consecutive numbers or consecutive multiples the number of the digits in the series is equal to (First Term - Last...
- by jba05d
Thu Jun 04, 2009 6:25 pm- Forum: Problem Solving
- Topic: fun with number properties
- Replies: 7
- Views: 1691
Exponents/Probability Factors Problem
N questions can either be true or false. If you answer all n correct you win. What is the least value of n for which the probability is less than 1/1000 for you to win by guessing randomly? a. 5 b. 10 c. 50 d. 100 e. 1000 I was able to derive the correct answer, which is B. However, I feel that I to...
- by jba05d
Thu Jun 04, 2009 5:45 pm- Forum: Problem Solving
- Topic: Exponents/Probability Factors Problem
- Replies: 1
- Views: 1257
- by jba05d
Thu Jun 04, 2009 5:38 pm- Forum: Data Sufficiency
- Topic: Data Sufficiency Problem
- Replies: 5
- Views: 3228
Data Sufficiency Problem
I ran across this very simple Data Sufficiency Problem but got the problem wrong when I tried to solve it. I think the problem is just worded poorly, but maybe someone can point out what I am missing. The question is as follows: Of 4800 voters who voted for Resolution K, 1800 were Democrat and 3000 ...
- by jba05d
Thu Jun 04, 2009 4:46 pm- Forum: Data Sufficiency
- Topic: Data Sufficiency Problem
- Replies: 5
- Views: 3228
The value is (1-x) because it represents the other part of the whole. The first part of the whole is x; that is, X represents the weight/percent/or part of the full mixture. Therefore, (1-x) represents that other part of the whole to make the mixture full. *Note Keep in mind that this formula would ...
- by jba05d
Thu Jun 04, 2009 4:35 pm- Forum: Problem Solving
- Topic: Mixture problems approach
- Replies: 3
- Views: 1893