Search found 124 matches


oopsie :) too many silly mistakes for the day, preceding the g-day. sorry all. I am out :)
however! this one is still the right choice :D
it ll be
(13*3)/(2^6) still GOTCHA ! hehe .terminating !

by NikolayZ

Thu Nov 05, 2009 11:18 am
Forum: Problem Solving
Topic: How to solve this one quickly?
Replies: 5
Views: 1015

backsolving backsolving backsolving. Notice - backsolve from E. Works for you more frequently then backsolving from A :) You need to prime factorize numerator and denominator. If denominator will consist of 2's or 5's - it is 100% terminating decimal. E) 39/128=(13*3)/(13*2*2*2*2)==>(3/2*2*2*2) => t...

by NikolayZ

Thu Nov 05, 2009 10:22 am
Forum: Problem Solving
Topic: How to solve this one quickly?
Replies: 5
Views: 1015

Oh my. Just figured it out. Forget all my previous solution. It is very similar to the sequence where we have only a1, that differs from other terms of sequence. i.e. all remaining will be a2=a1+x,a3=a2+x and so on. So, knowing that sequence is +2+1+5=+8. Then, you need just to backsolve from he ans...

by NikolayZ

Thu Nov 05, 2009 10:14 am
Forum: Problem Solving
Topic: PS -
Replies: 6
Views: 1317

Hey again mate. We have 362X215 1)3+6+2+X+2+1+5=4y insufficient, as x can be anything, so y can be anything. 2)if x differs from any of digits then it may be - 4,7,8,9, insufficient. 1+2) 19+x=4y, plug in all 4 numbers from the stmt 2. The right X is X, when added to 19, will be divisible by 4. Try ...

by NikolayZ

Thu Nov 05, 2009 10:01 am
Forum: Data Sufficiency
Topic: Prop Of Numbers
Replies: 3
Views: 1166

Hey Jamie ;) Don't want to disappoint you, but even 2007 edition compared to 3rd edition is a 2 hour reading thing :) fourth edition of MgmatSC is the best source for learning sentence correction ever created. If you feel that you need a significant improvement in your SC, you definitely need to pur...

by NikolayZ

Thu Nov 05, 2009 9:53 am
Forum: Sentence Correction
Topic: Manhattan GMAT Sentence Correction Guide
Replies: 1
Views: 917

hehe :D Nice post Stuart =)
+1 for the whole problem :)

by NikolayZ

Thu Nov 05, 2009 9:42 am
Forum: Problem Solving
Topic: Problem with quadratic equations!
Replies: 6
Views: 1708

If my reasoning is right, you should find the logic of the sequence : a1=64 a2=66 a3=67 a4=64+8=72 A5=66+8=74 a6=67+8=75 A7=72+8=80 a8=74+8=82 a9=75+8=83 a10=80+8=88 a11=82+8=90 a12=83+8=91 look , it is +2+1+5, +2+1+5,+2+1+5. soo, if i am correct we are able to find any number of a sequence using fo...

by NikolayZ

Thu Nov 05, 2009 6:43 am
Forum: Problem Solving
Topic: PS -
Replies: 6
Views: 1317

Argh, i should stop learning for the last day before exam :)
You are right. Thanks.
p.s. corrected previous message.

by NikolayZ

Thu Nov 05, 2009 5:30 am
Forum: Problem Solving
Topic: Gprep easy problem
Replies: 6
Views: 1091

no mate, C and D represent interest + principal. Question asked only about interest gained. So, b for simple.
Compounded interest gain formula is nicely posted by Acenikk ;)

by NikolayZ

Thu Nov 05, 2009 3:43 am
Forum: Problem Solving
Topic: Gprep easy problem
Replies: 6
Views: 1091

Well, khm, i am blamed, just figured it out :D
I don't know why, but i thought that compounded and simple rates differ only when we count interest quaterly or semi-annually :)
Xcusemeplz, you are right. OA is B.
Compounded would be A
Simple is B.

by NikolayZ

Thu Nov 05, 2009 3:00 am
Forum: Problem Solving
Topic: Gprep easy problem
Replies: 6
Views: 1091

ooops, you are right Ayushr. My school math is 7 years away so i made this silly mistake. indeed the radius must be 2. Then the answer to this particular problem is 0. If the circle equation looks like : x^2+y^2=16(radius 4), then there are 2 common roots. P.s. Then it is clear why the discriminant ...

by NikolayZ

Thu Nov 05, 2009 1:50 am
Forum: Problem Solving
Topic: Curve
Replies: 5
Views: 1002

Gprep easy problem

I came across this one doing gmatprep yesterday, it was one of my 4 mistakes in quant. But i was 100% sure that i solved it right. Problem: If 10000 principal has to be invested at a simple percent x for n years, which of the forrowing represents INTEREST gained by the investment. 1) 10000(x/100)^n ...

by NikolayZ

Thu Nov 05, 2009 1:39 am
Forum: Problem Solving
Topic: Gprep easy problem
Replies: 6
Views: 1091

From 1. We know that the power of 2 might be only one. But we don't know the powers of 3. Insufficient. stmt 2. 36=2*18=2*2*9=2*2*3*3. 24=2*12=2*2*6=2*2*2*3. 1,2,3,4,6,9,12,18,36. What from that list doesnt divide 24 ? it is 9,18 and 36. Stil N could be from 9,18 and 36. Combine both now. 9 doesn't ...

by NikolayZ

Thu Nov 05, 2009 12:53 am
Forum: Data Sufficiency
Topic: Help
Replies: 1
Views: 799

Hey there. The statement one tells us , that EG halves the the segment DF. Again, do not look at the picture as it is, abstract from it, you got just a triangle that might be iscoseles equilateral or none of these. From stmt 1 we only know that DF is halved. (Vertice E may be to the left and to the ...

by NikolayZ

Thu Nov 05, 2009 12:36 am
Forum: Data Sufficiency
Topic: triange
Replies: 1
Views: 1195

I assume that you got the idea why 1 and 2 both alone are insufficient. Let's figure out why it is an equilateral triangle. You know that 2 sides of a triangle have exactly the same length. So, this triangle must be iscoseles. THEN, because this triangle is iscoseles, the angles A and C must be equa...

by NikolayZ

Thu Nov 05, 2009 12:28 am
Forum: Data Sufficiency
Topic: Triangle
Replies: 6
Views: 1119