Search found 139 matches
garuhape wrote:I got itgaruhape wrote:Stomier,
can you please explain the general rule behind switching 4^18 to 2^36
Thx
4*4 = 4^2 = 2*2*2*2 = 2^4
(a^b)^c = a^(bc)
4^18 = (2^2)^18 = 2^(18*2) = 2^36
However,
a^(b^c) is not equal to a^bc
- by stormier
Mon Feb 21, 2011 3:34 pm- Forum: Problem Solving
- Topic: fraction and exponent question
- Replies: 5
- Views: 1062
Sorry if this question has already been posted before, but it came up on a practise test I took, and I am stuck as to how to solve it: If (1/5)m(1/4)18 = 1/2(10)35, m? a. 18 b. 17 c. 21 d. 35 e. 3 The answer is D (1/5)^m (1/4)^18 = 1/[2(10)^35] => 5^(-m)*2^(-36) = 2^(-1)*(10)^(-35) => 5^(-m)*2^(-36...
- by stormier
Mon Feb 21, 2011 1:05 pm- Forum: Problem Solving
- Topic: fraction and exponent question
- Replies: 5
- Views: 1062
When used as verb, its idiomatic to use aid in. He aided me in writing a paper.gmatapril wrote:What is the difference between AID IN and AID TO?
THANKS
aid to is not incorrect, but is less common.
The US provided monetary aid to earthquake victims of Haiti. - aid is used as noun here.
- by stormier
Mon Feb 21, 2011 12:33 pm- Forum: Sentence Correction
- Topic: AID IN
- Replies: 2
- Views: 1036
Despite Beethoven's traditional status as the first great Romantic composer, he is considered by some musicologists to be the last great composer of the Classical era. Despite Beethoven's traditional status as the first great Romantic composer, he is considered by some musicologists to be the last ...
- by stormier
Mon Feb 21, 2011 11:49 am- Forum: Sentence Correction
- Topic: mgmat sc
- Replies: 10
- Views: 1895
1/(5^10) = 2^10/10^10 = 1024/10^10 = 0.0000001024ankur.agrawal wrote:What is the tenth digit to the right of the decimal point, in the decimal expansion of 1/(5^10) ?
(A) 0
(B) 2
(C) 4
(D) 6
(E) 8
Answer C
- by stormier
Mon Feb 21, 2011 9:07 am- Forum: Problem Solving
- Topic: Number properties
- Replies: 2
- Views: 1536
State lawmakers are considering a law allowing children of divorced parents as young as seven to choose the parent with whom they will live, which will likely dissuade those parents from disciplining or punishing their children. A. allowing children of divorced parents as young as seven to choose t...
- by stormier
Mon Feb 21, 2011 9:00 am- Forum: Sentence Correction
- Topic: Modifier/Parallelism
- Replies: 3
- Views: 1314
one says : eight million people are as many as enrolled in universities. is better (when it comes to gmat) than Eight million people are as many as those enrolled in universities. how come? X is/are as many as Y X and Y should be parallel and comparable. Here, X = eight million people - noun Y also...
- by stormier
Mon Feb 21, 2011 7:41 am- Forum: Sentence Correction
- Topic: comparison expression
- Replies: 6
- Views: 2324
Least value = 2neilcao wrote:a number is the product of x numbers, when the number's last 6 digits are 0 (000000), what\s the least value of x?
we are talking about integers here.
example, 1000 * 1000 = 1000000
- by stormier
Mon Feb 21, 2011 7:31 am- Forum: Problem Solving
- Topic: A number is the product of x numbers,
- Replies: 3
- Views: 1136
This is an incomplete question. One needs to know whether the interest was compounded quarterly, annually, monthly, or ...neilcao wrote:2% compound interest，no money put in and out in 10 years，the interests for two years is 5050, what's the original amount of money
- by stormier
Mon Feb 21, 2011 7:27 am- Forum: Problem Solving
- Topic: Bank interest rate questions
- Replies: 3
- Views: 1268
80 bottles of drink are given to a group of people, the remaining number of drinks is 4 less than the number given to each person, which number cannot be the actual number of people in this group? 21 28 14 17 24 Suppose the total number of drinks is given evenly to each person let m drink be given ...
- by stormier
Mon Feb 21, 2011 7:23 am- Forum: Problem Solving
- Topic: problem 80 drinks given to a group of people
- Replies: 3
- Views: 1382
x ( x - k ) = k + 1 ==> x^2 - k*x - (k+1) = 0 ==> x^2 - (k+1)*x + 1*x - (k+1) = 0 ==> (x+1) (x- (k+1)) = 0 ==> x = -1 and x = k+1 ==> SUM = -1+k+1 ==> k Of course there is a quicker solution by plugging values.... Anurag - you mentioned " Any quadratic equations in x with two roots a and b can...
- by stormier
Sun Feb 20, 2011 6:30 pm- Forum: Problem Solving
- Topic: 300 tough Algebra
- Replies: 20
- Views: 39575
Hello, I was working through a GMAT Math CAT and could not solve this problem: The members of the newest recruiting class of a certain military organization are taking their physical conditioning test, and those who score in the bottom 16 percent will have to retest. If the scores are normally dist...
- by stormier
Sun Feb 20, 2011 6:16 pm- Forum: Data Sufficiency
- Topic: Standard Deviation
- Replies: 15
- Views: 3796
A diagram has exactly two black dots and one green dot for every two red dots. There are no dots of any other color in the diagram. Which of the following could be the number of dots in the diagram ? A] 3 B] 18 C] 36 D] 45 E] 52 The language of the question could have been better. Nevertheless, it ...
- by stormier
Sun Feb 20, 2011 11:44 am- Forum: Problem Solving
- Topic: Arithmetic:Ratio - What is number of dots ?
- Replies: 3
- Views: 1601
A certain city with a population of 132,000 is to be divided into 11 voting districts, and no district is to have a population that is more than 10% grater than the population of any other district.What is the minimum possible population that the least populated district could have ? A.10,700 B.10,...
- by stormier
Sun Feb 20, 2011 10:43 am- Forum: Problem Solving
- Topic: GMAT Prep Q - Population
- Replies: 4
- Views: 1697
If abc = b3 , which of the following must be true? I. ac = b2 II. b = 0 III. ac = 1 A) None B) I only C) II only D) I and III E) II and III This is from Kaplan CAT. I am not quite sure how they arrived at the answer. OA is A abc = b^3 This is possible if either b=0; or ac = b^2 But none of the abov...
- by stormier
Sun Feb 20, 2011 9:05 am- Forum: Problem Solving
- Topic: If abc = b3 , which of the following must be true?
- Replies: 4
- Views: 1971