Search found 1022 matches
Ian, that was a nice post of yours.. Practically, the divisibility test by 2,3,5 only works when we solve a problem. We feel tough to use other methods or either forget the exact method. Moreover questions in GMAT are quite simple and it doesn't require such tricks every now and then. The method you...
- by shashank.ism
Thu Jun 30, 2011 2:47 am- Forum: GMAT Math
- Topic: How to tell if a number is divisible by 7?
- Replies: 5
- Views: 4076
Just want to confirm the replies given above -- it's exactly right that you CAN'T simplify root(y^2) to y safely, for precisely the reason explained: if y is negative, root(y^2) will NOT equal y but rather the opposite of y. Thanks Ashley for confirming my post... 'I'm not not a girl... hehhehehhe ...
- by shashank.ism
Wed Jun 29, 2011 12:54 pm- Forum: Problem Solving
- Topic: 5- root of y to the power of 2
- Replies: 9
- Views: 2355
Taking into consideration "Divisibility by 7", I have posted a similar steps on my blog-post. http://mba.webmaggu.com/divisibility-by-7/ Though checking divisibility by this method is quite repetitive and cumbersome. So I would better recommend to divide the number simply by 7 and get the ...
- by shashank.ism
Wed Jun 29, 2011 12:15 pm- Forum: GMAT Math
- Topic: How to tell if a number is divisible by 7?
- Replies: 5
- Views: 4076
Thanks Ashley. One quick question. Can we write the equation like 5-y = -3 by canceling square root with square? since √y² is positive so you can't write √y² = y as we don't know whether y is positive or not but we certainly know that √y² is positive. so we can write √y² = |y| hence √...
- by shashank.ism
Wed Jun 29, 2011 4:47 am- Forum: Problem Solving
- Topic: 5- root of y to the power of 2
- Replies: 9
- Views: 2355
√y² = |y|vidhya16 wrote:5 -√y² = -3 .Whats the value of y?
Ta
so 5 -√y² = -3 -> 5 -|y| = -3
case 1: if y>0, 5-y = -3 -> y= 8
case 2: if y<0, 5-(-y) = -3 -> y=-8
so y = 8 or -8.
- by shashank.ism
Wed Jun 29, 2011 4:44 am- Forum: Problem Solving
- Topic: 5- root of y to the power of 2
- Replies: 9
- Views: 2355
P.S. Shortcuts only work for you, when you have command over subject, your basics is clear and you can solve the problem with long method. If you are not able to solve problems by proper method, shortcuts will certainly lead you to crapy answers. These strategies are not intended to replace mathema...
- by shashank.ism
Wed Mar 16, 2011 1:24 pm- Forum: Problem Solving
- Topic: Spaceland Prep Strategy Question #5
- Replies: 10
- Views: 1590
But you cant be very sure with these type of solutions and ultimately land up with wrong solution. For eg. IF we go by question, cost of 50 kale is t dollars which shows that "t" is dimensionless and its unit is dollar. though in answers no unit is specified.... If we go by your method, it...
- by shashank.ism
Tue Mar 15, 2011 6:39 pm- Forum: Problem Solving
- Topic: Spaceland Prep Strategy Question #5
- Replies: 10
- Views: 1590
hey spaceland prep if there is such a simple mathematical solution for this question .. why would we analyse that way..
- by shashank.ism
Tue Mar 15, 2011 8:59 am- Forum: Problem Solving
- Topic: Spaceland Prep Strategy Question #5
- Replies: 10
- Views: 1590
What are the values of X? | 3 + 2x | > |4 - x | lets solve it this way.. case 1 : 3+2x>0 -->x>-3/2 and 4-x>0-->x<4 so | 3 + 2x | > |4 - x | --> 3+2x > 4-x --> 3x>1 --> x>1/3. overall : 1/3<x<4. case2 : 3+2x>0 --> x>-3/2 and 4-x<0 --> x>4 so | 3 + 2x | > |4 - x | --> 3+2x > x-4 --> x>-1. overall : x...
- by shashank.ism
Mon Mar 14, 2011 7:10 am- Forum: GMAT Math
- Topic: Absolute Inequality fundamentals
- Replies: 3
- Views: 1621
What would be the solution for |X| - |Y| = |X+Y| ; XY != 0 ; X and Y are integers. Can anyone please provide algebraic method ? Here's what I did:- Squaring on both sides and using Schwarz Inequality, -2|X||Y| =< 2|XY| Therefore, 4|XY| > 0 therefore, XY > 0 ??? The answer is wrong. I am lost. Can a...
- by shashank.ism
Mon Mar 14, 2011 6:50 am- Forum: GMAT Math
- Topic: Absolute value question
- Replies: 3
- Views: 2070
ques A police officer, travelling at 100 miles per hour, pursues philip who has 30 minutes head start. The police officer overtakes philip in two hours. Find Philip's speed? Let the speed of philip be v miles per hour. so distance covered by philip in 2 hrs and 30 min = vx2.5 = 2.5v miles distance ...
- by shashank.ism
Mon Mar 14, 2011 2:08 am- Forum: Problem Solving
- Topic: Time and dfistance
- Replies: 5
- Views: 4023
Thanks Arora ... i would be coming with few more helpful websites.. I am working on the same.... 
Actually I always forgot those word meanings, so I thought why not a dictionary with images.. and thats why I made
http://dictionary.webmaggu.com . It really helps atleast to me.. :)
- by shashank.ism
Mon Mar 14, 2011 2:02 am- Forum: Lounge
- Topic: Back to BTG ... :)
- Replies: 3
- Views: 1597
- by shashank.ism
Tue Mar 08, 2011 12:04 pm- Forum: Lounge
- Topic: Back to BTG ... :)
- Replies: 3
- Views: 1597
Which of the 5 terms p, q, p + q, p – 1, and q + 1, represents the median of these 5 terms? (1) p > q (2) p – q < 1 Is there a way to do this without plugging? Median is a type of average, found by arranging the values in order and then selecting the one in the middle. so lets start arranging a...
- by shashank.ism
Mon Mar 07, 2011 4:38 am- Forum: Problem Solving
- Topic: Median
- Replies: 3
- Views: 1002
Back to BTG ... :)
Hey friends missing those days when I was among the top members who posted approximately 850 posts in a span of 1 month and I was one of the dark horse competing those posts in a span of just 20 days.. :)..I was very busy these days due to some personal work, in my job and offcourse designing my own...
- by shashank.ism
Mon Mar 07, 2011 4:25 am- Forum: Lounge
- Topic: Back to BTG ... :)
- Replies: 3
- Views: 1597