Search found 75 matches
exponents
If x and y are integers and
(15x + 15^(x+1))/ 4y = 15y,
what is the value of x?
2
3
4
5
Cannot be determined
cant we backsolve this bad boy? What is the best and most sure shot way?
- by simba12123
Tue Nov 04, 2008 8:51 pm- Forum: Problem Solving
- Topic: exponents
- Replies: 9
- Views: 2266
standard deviation
What is the standard deviation of Q, a set of consecutive integers?
(1) Q has 21 members.
(2) The median value of set Q is 20.
qa is a
- by simba12123
Tue Nov 04, 2008 8:09 pm- Forum: Data Sufficiency
- Topic: standard deviation
- Replies: 6
- Views: 7335
- by simba12123
Tue Nov 04, 2008 7:29 pm- Forum: Data Sufficiency
- Topic: Pls chk if approach is correct?
- Replies: 19
- Views: 3658
Nice post
Wonderful Question statement 1: Sufficient since a is negative choosing a =-2 ad b=-3 plugging in will give consistent no -----------a= -2 and b=-4 plugging will give same hence sufficient statement 2: insufficient choose a=0 and b= 1 yields no as answer now searching for a number to get a yes and h...
- by simba12123
Tue Nov 04, 2008 6:35 pm- Forum: Data Sufficiency
- Topic: 5
- Replies: 4
- Views: 1513
yellow sunglasses
OK,
I would love to try this yellow tinted sunglasses idea on the exam. I tried a pair on the other day during a CAT exam and seriously it works. However, the question is - can we be allowed to bring it into the room with us on exam day?
- by simba12123
Tue Nov 04, 2008 3:55 pm- Forum: GMAT Strategy
- Topic: Journey from 650 - 700!
- Replies: 13
- Views: 4360
x negativity part two
Is x a negative number? (1) x^2 is a positive number. (2) x · |y| is not a positive number. Here is a great question - I previously posted a question about negativity and I believe it was a learning experience for everyone. Here is a question that gives a great lesson, which is PAY ATTENTION TO THE ...
- by simba12123
Tue Nov 04, 2008 2:56 pm- Forum: Data Sufficiency
- Topic: x negativity part two
- Replies: 2
- Views: 1179
combinations
Six mobsters have arrived at the theater for the premiere of the film “Goodbuddies.” One of the mobsters, Frankie, is an informer, and he's afraid that another member of his crew, Joey, is on to him. Frankie, wanting to keep Joey in his sights, insists upon standing behind Joey in line at the conces...
- by simba12123
Tue Nov 04, 2008 2:36 pm- Forum: Problem Solving
- Topic: combinations
- Replies: 4
- Views: 1932
How crazy!?
I was taking an mgmat cat today and saw this question in front of me. LOL I cant really see why D is wrong. Yes we all rock but I need to get a bit more accurate! Can some pros shed some light on this?
Still struggling to see why choice D is insufficient!
- by simba12123
Tue Nov 04, 2008 10:50 am- Forum: Data Sufficiency
- Topic: Pls chk if approach is correct?
- Replies: 19
- Views: 3658
factor problem
If 5^(6x) = 125,000 Then, 5^(2x−1) = ?
5^6x= 5^3 10^3
(5^6x) - (5^3) =10^3
so ((5^6x) - (5^3))/3 = 10^3/3
I think i am on the right track and need to tie this up!
qa 10
Source is GuruGuide and its an advanced question.
- by simba12123
Mon Nov 03, 2008 8:14 pm- Forum: Problem Solving
- Topic: factor problem
- Replies: 7
- Views: 1637
According to Cramya and Logitech: Statement one explains clearly that n is greater than abs. 4 Statement two explains that n is either a positive or negative fraction. We have an agreement of everyone choosing choice D. Here is the kink and wet blanket on the party bonfire. Statements 1 and 2 will n...
- by simba12123
Mon Nov 03, 2008 7:35 pm- Forum: Data Sufficiency
- Topic: Pls chk if approach is correct?
- Replies: 19
- Views: 3658
dont mess with inequalities
I have been running through many inequalities and saw that I was getting slapped around by many of these questions. I like to plug in numbers but am realizing that i need to take a more theoretical and algebraic approach. I know for sure that rephrasing was a big issue for me. I made a violation in ...
- by simba12123
Mon Nov 03, 2008 6:22 am- Forum: Data Sufficiency
- Topic: og ds x/y
- Replies: 6
- Views: 1887
pandoras box
THe main problem was very bad rephrasing and making things harder than they really were. ONE FINAL QUESTION. In picking numbers but following every step with Stacy: statement one yields x= -2 and x= 1/2 statement two yields x = 1/2 and x =-1/2 combining statements 1 and 2, we must only bring in what...
- by simba12123
Mon Nov 03, 2008 6:10 am- Forum: Data Sufficiency
- Topic: x negativity
- Replies: 27
- Views: 3950
details
Success is in the details! Thank you folks. THe major takeaway is that an algebraic approach should not be looked over so easily.
- by simba12123
Mon Nov 03, 2008 5:06 am- Forum: Data Sufficiency
- Topic: og ds 127, all math pros needed for this question
- Replies: 3
- Views: 1481
details
Success is in the details! Thank you folks. THe major takeaway is that an algebraic approach should not be looked over so easily.
- by simba12123
Sun Nov 02, 2008 10:11 pm- Forum: Data Sufficiency
- Topic: og ds 127, all math pros needed for this question
- Replies: 3
- Views: 1481
og ds 143
If m>0 N>0 is, (m+x)/(n+x)>m/n? st. 1 m<n st. 2 x>0 answer is c I simplified this down to is n>m? Did I over simplify this statement. I cross multiplied giving (m+x)(n)>(m)(n+x) then got ----> (mn)(xn)>(mn)(xn) ----> cancel out the mn's on both sides. Left with xn>mx subtract the x's from one side t...
- by simba12123
Sun Nov 02, 2008 7:04 pm- Forum: Data Sufficiency
- Topic: og ds 143
- Replies: 9
- Views: 1999