Search found 34 matches
x^2 + 2x > x^2 + x or is x > 0 1) x ^ odd integer > x ^ even integer the statement seems quite ambiguous because nothing is mentioned here about relation between odd integer and even integer. Though it indicates that x^ odd integer must be a positive number. because x^even integer is always positive...
- by Amiable Scholar
Fri Oct 28, 2011 6:30 pm- Forum: Data Sufficiency
- Topic: ODD/EVEN Check
- Replies: 3
- Views: 1187
copies of news paper A = p
copies of news paper B = 100 - P
Total revenue = p + (100 - P)1.25 = 125 - .25 p
as per given conditions
p/(125-.25p)=r/100
=>
r = 100 p/(125 -.25p)
= 400 p /500 -p multiplying 4 in both numerator and denominator
so IMO D
- by Amiable Scholar
Fri Oct 28, 2011 11:13 am- Forum: Problem Solving
- Topic: Newspaper A
- Replies: 4
- Views: 1343
x(x- (5x+6/x) ) = 0. Should have been written as : x(x- {(5x+6)/x)} ) = 0. Now x *(x ^2 -5x -6)/ x = 0 we can simplify it to (x ^2 -5x -6) = 0 which gives soln as x = 6 or -1 basic quadriatic eqn. "Now x *(x ^2 -5x -6)/ x = 0" - How do you get rid of the x outside the parentheses? x(x- {(...
- by Amiable Scholar
Fri Oct 28, 2011 8:58 am- Forum: Problem Solving
- Topic: solving for x, distribution of x...need help please
- Replies: 5
- Views: 1484
if x is the quantity of water initially in the lake remaining water at the end of year = x - x*2/7 = x*5/7 similarly after end of second year remaning water = x* 5/7 * 5/7 = x* (5/7)^2 so as per question if it happens after n years x *(5/7)^n < x/4 => (5/7)^n < 1/4 here for a fast calculation 5/7 * ...
- by Amiable Scholar
Fri Oct 28, 2011 8:37 am- Forum: Problem Solving
- Topic: Liters of water
- Replies: 7
- Views: 2212
NeelGandham and GmatMathPro. My bad , really was out of touch from the quant problems for 1 year so missed some basic fundamentals in simple problem earlier. x(x-1) < 0 first need to find out the roots 0 and 1 here .. (considering equality) .. so need to check the sign of expression in following int...
- by Amiable Scholar
Fri Oct 28, 2011 8:01 am- Forum: Data Sufficiency
- Topic: Is y between 1 and 2, exclusive?
- Replies: 5
- Views: 1663
I would go only with D if the ratio is 10 times instead of 20 times.
is 20 times correct figure here
- by Amiable Scholar
Fri Oct 28, 2011 3:26 am- Forum: Critical Reasoning
- Topic: LSAT set3/quest12
- Replies: 5
- Views: 1823
This can be done by simple set rules
Let M is the set of students taking Math class
L is the set of students taking literature
so we have to find out n(M U L)
n(M) = 10
n (L) = 6
n( M ∩ L )= 4
n(M U L )= n(M) + n(L) - n(M ∩ L)
= 10 + 6 - 4
= 12
- by Amiable Scholar
Fri Oct 28, 2011 3:02 am- Forum: Problem Solving
- Topic: How many students are taking either math or literature class
- Replies: 6
- Views: 1744
you might have seen that even BTG forum has those list of idioms.. did u learn them? if yes, did it help you ? ( i ask this because i struggle a lot in learning them and using them in a test scenario) Vaibhav , You can see the last post from the admin regarding idioms http://www.beatthegmat.com/idi...
- by Amiable Scholar
Fri Oct 28, 2011 1:36 am- Forum: I just Beat The GMAT!
- Topic: 770 (50q, 44v), Definitely beat the GMAT
- Replies: 8
- Views: 4451
We can do all the guess work .. but for a systematic simple approach (without using calculus and cordinate geometry fundas :) ) let x^2-x = y => x^2-x -y =0 now for a quadratic equation ax2+bx+c if Roots are real then b^2-4ac =>0 => 1+4y =>0 -> y>= -1/4 ----- (A) here roots (x) lie between 0 and 1 s...
- by Amiable Scholar
Thu Oct 27, 2011 9:11 pm- Forum: Problem Solving
- Topic: Value of x^2-x when x is between 0 and 1.
- Replies: 6
- Views: 1648
1) y^2 < y => y (y-1) < 0 => y< 0 or y <1 => y <1 Sufficient
2) 1<=y^2 <=2 => {y:-1.4 <= y <= -1} U {y: 1<=y<=1.4} not sufficient
- by Amiable Scholar
Thu Oct 27, 2011 6:30 pm- Forum: Data Sufficiency
- Topic: Is y between 1 and 2, exclusive?
- Replies: 5
- Views: 1663
[spoiler] for me the only question here is what to do with E. to be true, because for me it is not true -2 < a < 11 ------------- (1) 3<b<12 ------------------ (2) so for a consider 2 cases (A) -2< a < 0 in that case reverse the sign to make middle term positive => 0 < -a < 2 remember .. -a is posi...
- by Amiable Scholar
Thu Oct 27, 2011 6:21 pm- Forum: Problem Solving
- Topic: If -2<a<11 and 3<b<12, then which of the folloin
- Replies: 4
- Views: 4255
What is sqrt(x^2-6x+9)+sqrt(2-x)+(x-3) if each term in this expression is well defined ? And just for the future - what does it mean - if each term in expression is well defined ? It means the each term is a real term ... sqrt(x^2-6x+9) is real and also sqrt(2-x) is well defined here .. i.e. it a r...
- by Amiable Scholar
Thu Oct 27, 2011 6:09 pm- Forum: Problem Solving
- Topic: If each term in this expression is well defined.
- Replies: 2
- Views: 1806
I agree with you. Normally you don't expect/encounter such calculation based problem in GMAT.GmatMathPro wrote:
What's the source on this anyway? Seems a little calculation-heavy for a GMAT problem.
- by Amiable Scholar
Thu Oct 27, 2011 5:58 pm- Forum: Problem Solving
- Topic: A 5-year investment note offers.....
- Replies: 9
- Views: 1898
the side of your square is not the radius but equal to diameter of the circle. 
so you need to divide it by 2
so radius is
(2k/sqrt(2))/2
=k/sqrt(2)
- by Amiable Scholar
Thu Oct 27, 2011 8:27 am- Forum: Problem Solving
- Topic: geometry circle
- Replies: 3
- Views: 2195
- by Amiable Scholar
Mon Oct 24, 2011 8:19 pm- Forum: Problem Solving
- Topic: Word Problem!
- Replies: 6
- Views: 1391