Search found 1179 matches

Box, Bags, and Marbles!!

Data Sufficiency

Let the number of bags be n and the number of marbles in each bag except one be x. So one bag has x+1 marble. Or (n-1)*x + (x+1) = 2001. Or nx + 1 = 2001. Or nx = 2000. Note that both n and x are positive integers and are factors of 2000. First consider (1) alone . The factors of 2000 between 13 and...

by Rahul@gurome

Sat Feb 26, 2011 3:14 am
Forum: Data Sufficiency
Topic: Box, Bags, and Marbles!!
Replies: 3
Views: 961

JH- Geo 2

Data Sufficiency

Rahul, Just two follow up questions 1) We know 30/60/90 has lengths x: xroot(3): 2x. If we know the length of a triangle is x: xroot(3) : 2x do we know if its a 30/60/90? 2) In the previous problem we know two sides of a triangle and one angle. What additional info.will we need to deem that the tri...

by Rahul@gurome

Fri Feb 25, 2011 10:54 pm
Forum: Data Sufficiency
Topic: JH- Geo 2
Replies: 3
Views: 943

JH- Geo 2

Data Sufficiency

Solution: Obviously, each statement alone is not sufficient to answer the question. We next combine both the statements together and check. On combining we know that AB is 5 and AC is 5*sqrt2. Now, in a right angled triangle, hypotenuse is the largest size. Now since AC > AB, AB can never be the hyp...

by Rahul@gurome

Fri Feb 25, 2011 10:23 pm
Forum: Data Sufficiency
Topic: JH- Geo 2
Replies: 3
Views: 943

Alligation?

Problem Solving

Solution: The container has 40 liters of milk. From this, 4 liters of milk was taken away and replaced with water. So, now we have 36 liters of milk and 4 liters of water. Hence the new mixture has milk and water in the ratio 36:4 or 9:1. So, now if we withdraw 4 liters, the remaining 36 liters has ...

by Rahul@gurome

Fri Feb 25, 2011 9:44 pm
Forum: Problem Solving
Topic: Alligation?
Replies: 5
Views: 1953

The second-to-last term

Data Sufficiency

In a sequence of terms in which each term is three times the previous term, what is the fourth term? (1) The first term is 3. (2) The second-to-last term is 3^10. A Does somebody know what is the meaning of the second statement?, what can I get from it.? Thank Solution: Consider first (1) alone. Th...

by Rahul@gurome

Wed Feb 02, 2011 7:02 pm
Forum: Data Sufficiency
Topic: The second-to-last term
Replies: 2
Views: 827

Probability--suzan

Problem Solving

Usually I'm ok with these but this one threw me for a loop. Could anyone explain the mistake in my approach? Take the unrestricted combinations and subtract out the restricted combinations Unrestricted = 7! = 5040 possible combinations Restriction 1: She won't sit in the first seat. How many ways c...

by Rahul@gurome

Wed Feb 02, 2011 6:52 pm
Forum: Problem Solving
Topic: Probability--suzan
Replies: 7
Views: 2306

Range of integers ques

Problem Solving

I'm confused here... The range isn't inclusive? I counted 1 through 7, inclusive. But to find the range you simply take max - min? Thanks! You don't have to take the number of elements between 1 and 7 inclusive. You have to take the difference between maximum positive value which is 7 and minimum p...

by Rahul@gurome

Wed Feb 02, 2011 6:44 pm
Forum: Problem Solving
Topic: Range of integers ques
Replies: 7
Views: 1318

Range of integers ques

Problem Solving

quaktar0004 wrote:Why isn't "0" included in this range? I too thought the answer should be 7: 7-0=7. Please advise.
The reason is that zero is considered neither positive or negative.
You have to take only the positive integers while calculating the range.

by Rahul@gurome

Tue Feb 01, 2011 6:53 pm
Forum: Problem Solving
Topic: Range of integers ques
Replies: 7
Views: 1318

Range of integers ques

Problem Solving

Note that we have been asked the range for positive integers in the list. Range is the difference between maximum and minimum value. The integers in the list are -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7. The minimum positive value is 1 and the maximum positive value is 7. So the range of positive inte...

by Rahul@gurome

Tue Feb 01, 2011 12:43 am
Forum: Problem Solving
Topic: Range of integers ques
Replies: 7
Views: 1318

prime factorization

Problem Solving

Solution: n * 2^5 * 6^2 * 7^3 = n * 2^5 * 2^2 * 3^2 * 7^3 = n * 2^7 * 3^2 * 7^3. Since two 3's are there in the above expression, we need one 3 more to get 3^3 as factor. Also since 5 is not there in the expression, we need two 5's as factors. So, the minimum value of n is 5^2 * 3 = 75. The correct ...

by Rahul@gurome

Sun Jan 30, 2011 6:36 pm
Forum: Problem Solving
Topic: prime factorization
Replies: 1
Views: 755

If y â‰¥ 0, What is the value of x?

Data Sufficiency

Consider first (1) alone. It means lx-3l >= 0. This will be true for infinite many values of x. So, statement (1) alone is not sufficient to answer the question. We next consider statement (2) alone. This means lx-3l <= 0. Since, modulus cannot be negative, lx-3l=0. Or x = 3. So, (2) alone is suffic...

by Rahul@gurome

Tue Jan 25, 2011 9:00 pm
Forum: Data Sufficiency
Topic: If y â‰¥ 0, What is the value of x?
Replies: 2
Views: 947

Five DS questions for practice today. Try !

Data Sufficiency

@kvcpk : Thanx for pointing it out. Edited the reply.

by Rahul@gurome

Mon Jan 24, 2011 10:29 pm
Forum: Data Sufficiency
Topic: Five DS questions for practice today. Try !
Replies: 8
Views: 1156

Five DS questions for practice today. Try !

Data Sufficiency

if a,b,c are positive, I dont think 1/a + 1/b + 1/c can ever be 0.
You're correct.
Ideally the question should declare a, b, c as non-zero integers.

by Rahul@gurome

Mon Jan 24, 2011 10:07 pm
Forum: Data Sufficiency
Topic: Five DS questions for practice today. Try !
Replies: 8
Views: 1156

Question from MGMAT CAT Test

Data Sufficiency

... i don't have a very comfortable understanding of standard deviations. For a data set, standard deviation is the measure of dispersion or variation of the data from the mean or average. A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standa...

by Rahul@gurome

Mon Jan 24, 2011 9:57 pm
Forum: Data Sufficiency
Topic: Question from MGMAT CAT Test
Replies: 3
Views: 2021

Five DS questions for practice today. Try !

Data Sufficiency

5. If n is a positive integer that is less than 10, what is the value of n? 1) n is the tenths digit in the decimal representation of 1/n. 2) n is the hundredths digit in the decimal representation of 1/n. I believe the original question is more like the above. Now, as n < 10, n can be any of the f...

by Rahul@gurome

Mon Jan 24, 2011 9:35 pm
Forum: Data Sufficiency
Topic: Five DS questions for practice today. Try !
Replies: 8
Views: 1156