Search found 57 matches
Another simple solution: Let Bobby's age now=B and Johnny's age now=J years. So the diff in their ages is=B-J So, Johnny was half old as Bobby is now=B/2 Then, Bobby's age was=B/2+(B-J) As per stem, J=B/2+(B-J) or, 2J=3B/2 or, 4J=3B Statement 1: When Johnny was born Bobby's age was B-J So, B=4(B-J) ...
- by [email protected]
Tue Jun 26, 2012 10:59 pm- Forum: Data Sufficiency
- Topic: Bobby & Johnny
- Replies: 3
- Views: 1352
A sequence of numbers (geometric sequence) is given by the expression: http://s7.postimage.org/dc6alka5j/image.png If the sequence begins with n = 1, what are the first two terms for which http://s7.postimage.org/w8bz5ec13/image.png ? options: A ) g10, g11 B)g11, g12 C) g12, g13 D) g13, g14 E) g14,...
- by [email protected]
Mon Mar 26, 2012 8:07 pm- Forum: Problem Solving
- Topic: SEQUENCE
- Replies: 3
- Views: 1588
In a xy-plane, region R consists of all the points (x,y) such that 2x + 3y = 6 . Is the point (r,s) in region R? 1. 3r + 2s = 6 2. R < 3 and s < 2 At first i made it into an y=mx+b equation because thats the form of the equation that i am more comfortable with working with, but then it got too conf...
- by [email protected]
Thu Mar 22, 2012 4:48 pm- Forum: Data Sufficiency
- Topic: OG 121 How to do it fast?
- Replies: 2
- Views: 1154
Without picking numbers it can be solved algebraically as well. Let x be the smallest of the odd numbers <y, so y=x+2 and z>y so z=x+4 {SInce x,y,z are consecutive odd numbers}. Then, x^2+(x+2)^2+(x+4)^2=683 or, x^2+x^2+4x+4+x^2+8x+16=683 or, 3x^2+12x=663 or x^2+4x-221=0 or (x+17)(x-13)=0 Hence x is...
- by [email protected]
Sun Mar 18, 2012 9:00 pm- Forum: Problem Solving
- Topic: consecutive numbers
- Replies: 9
- Views: 1944
- by [email protected]
Wed Mar 14, 2012 8:04 pm- Forum: Problem Solving
- Topic: Gmat prep problem - Expert's help preferred
- Replies: 5
- Views: 1583
Let the length of the train=d and the speed of the car x km/hr. The car travels from rear end to the front and to the rear end again. Total time elapsed=1 hr, since during this time the train has travelled 1 km. Total time taken by the car=1 So, d/(x-1) + d/(x+1)=1 ( since from rear end to front end...
- by [email protected]
Wed Mar 07, 2012 7:43 pm- Forum: Problem Solving
- Topic: The Car and the Train
- Replies: 1
- Views: 912
Root(3-x)=1-root(2x)
3-x=(1-root(2x))^2
3-x=2x+1-2*root(2x)
3x=2*root(2x)+2 ---Eq 1
So 9x^2=(2*root(2x)+2)^2
=(4+8*root(2x)+8x)
=4(1+2x+2*root(2x))
=4(1+2x+3x-2) --substituting from Eq 1
=4(5x-1)
=20x-4
OA is E
- by [email protected]
Wed Mar 07, 2012 7:14 pm- Forum: Problem Solving
- Topic: Roots problem 2
- Replies: 4
- Views: 1249
n friends contributed and then n friends told n other friends i.e, n^2 more. So, the total number of contributors = n + n^2 Statement 1: n/(n + n^2) = 1/16 16n = n + n^2 n=15 since n can't be 0 SUFFICIENT Statement 2: 500(total number of contributors) = 120,000 500(n + n^2) = 120,000 500n + 500n^2 =...
- by [email protected]
Mon Mar 05, 2012 6:54 pm- Forum: Problem Solving
- Topic: data sufficiency, official guide 12th edition #70
- Replies: 2
- Views: 1024
Please keep in mind that X & Y both are integers.
So, X/Y=96.12
=> X-96Y=0.12Y
So 0.12Y is the reminder and this is equal to 9.
so Y=9/0.12 or Y=75.
OA is B
- by [email protected]
Mon Mar 05, 2012 5:43 pm- Forum: Problem Solving
- Topic: OG PS 106
- Replies: 6
- Views: 1419
Let the perpendicular of the smaller traingle is z. now, perpendicular of the bigger trianlge is sqrt(25^2-4x^2)=sqrt(21)*x Now since both the smaller triangle and biger trianlge are similar(one angle is 90,one angle is common) so,2x/y=(sqrt)21*x/z so, z=(sqrt)21*y/2 Hence, area of the shaded region...
- by [email protected]
Mon Mar 05, 2012 5:34 pm- Forum: Problem Solving
- Topic: triangle
- Replies: 4
- Views: 1172
We need to determine whether Transcorp will achieve its goal of reducing shipping time. A.This might lower costs—but it is not directly relevant to the Transcorp's goal. B Tt has nothing to do with whether the current plan will reduce shipping time. C This statement properly identifies something t...
- by [email protected]
Sun Feb 26, 2012 7:36 pm- Forum: Critical Reasoning
- Topic: CR question
- Replies: 6
- Views: 6366
A) 'As a result' is not used correctly here. The cause is not properly defined. B) 'and harmless' is not directly refering to Tomato. 'it was therefore once' is not correct. 'it' can refer to tomato, or nightshade family, or belladona. Unclear anticedent for the pronoun. C) ', and is a member...' is...
- by [email protected]
Sun Feb 26, 2012 7:03 pm- Forum: Sentence Correction
- Topic: Tomato
- Replies: 4
- Views: 1383
A - It doesn't prove that surgery is unncessary. B - if this is true then 'most' surgeries would be unnecessary. C - very generic, we cannot derive anything from this D - close one. We can say that since it is difficult to decide what to be done 'certain' procedures would be unnecessary ( not 'most'...
- by [email protected]
Mon Feb 20, 2012 9:22 pm- Forum: Critical Reasoning
- Topic: variation
- Replies: 7
- Views: 1319
A & B are out for using 'in part' C is also out as it is passive. D) There's no question of SHOULD here. The issue is meaning. The breeders crossbreed because they WANT something to happen. E) It isn't as parallel as we'd like. It would be nice to say "partly to A" and "partly to ...
- by [email protected]
Mon Feb 20, 2012 9:15 pm- Forum: Sentence Correction
- Topic: cattle breeders
- Replies: 4
- Views: 1720
- by [email protected]
Wed Feb 15, 2012 1:00 am- Forum: Sentence Correction
- Topic: ordering or events
- Replies: 4
- Views: 1449