GMAT Problem Solving Discussions

MBA
4186

Hi.

Can anyone list the number of questions from each topic asked in GMAT?

Thanks

4187

Hi.

Can anyone list the number of questions, from each topic, asked in GMAT?

here is the topic list:


Fractions-Decimals-Percents,
Ratios-Proportions,
Exponents-Roots,
Statistics-Data Interpretation,
Sets,
Combinatorics-Probability,
Linear Equations,
Non-Linear Equations,
Inequalities-Absolute Values,
Rate-Work,
Functions-Sequences,
Lines-Angles,
Triangles,
Quadrilaterals,
Circles,
3-d Geometry and
Coordinate Geometry.



Thanks

4188

A----------B---------C----------D

Is
CD > BC ?
(1) AD = 20
(2) AB = CD



A Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D EACH Statement ALONE is sufficient.
E Statements (1) and (2) TOGETHER are NOT sufficient.

I think E is the correct answer.
If we consider A=1, B=20, C=1 and D=20, then CD can not be > BC

4189
Hi.

Can anyone list the number of questions, from each topic, asked in GMAT?

here is the topic list:


Fractions-Decimals-Percents,
Ratios-Proportions,
Exponents-Roots,
Statistics-Data Interpretation,
Sets,
Combinatorics-Probability,
Linear Equations,
Non-Linear Equations,
Inequalities-Absolute Values,
Rate-Work,
Functions-Sequences,
Lines-Angles,
Triangles,
Quadrilaterals,
Circles,
3-d Geometry and
Coordinate Geometry.



Thanks


I do not remember the exact number of questions that I got from each of the topic but here is the approx break up...
Fractions-Decimals-Percents - 2 to 3
Ratios-Proportions - 2
Exponents-Roots - 2 to 3
Statistics-Data Interpretation - 3 to 4
Sets -3
Combinatorics-Probability - 2 to 3
Linear Equations and Non-Linear Equations - around 3
Inequalities-Absolute Values - 4 to 5
Rate-Work- guess 1
Functions-Sequences - 1
Lines-Angles, - 2
Triangles, - 1
Quadrilaterals - 1
Coordinate Geometry - 3 to 4
4190
smokinskull86 Says
The answer is option C, the best way to solve such problems (if you did not understand the logic in the answer) is to go ahead manually. Starting from 707,711,717 onwards you can identify how many such occurences occur tiill 769, then add 770,771,772 etc (without 777) till 799, and then simply multiply by 3 (turns out to be 26*3=7 (multiplied by 3 because we have to find for 800-999) and then add 2 more, viz. 800 and 900. So you get 80 as the answer in the end.

@smokinskull86 Is there any structured approach to tackle these kind of problems?
4191

And : E
option a alon doest tell u anything.same for option b.
takin both the option 2gethr u cant calculate teh values of these lines...!!!

4192

Ans : E, as individual values of AB, BC, and CD cant be calculated.

4193

Guys to get a Score of 50,51 in Verbal, what is maximum number of question we should attempt right from 37

I know its little difficult as its we get marks according to difficult questions we have answered....BUt STILL A ROUGH IDEA may be good

4194
Guys to get a Score of 50,51 in Verbal, what is maximum number of question we should attempt right from 37

I know its little difficult as its we get marks according to difficult questions we have answered....BUt STILL A ROUGH IDEA may be good

hey atul,

do u mean quant or verbal????coz u get 37 question in quant and 41 in verbal....
well nobody can give u any idea on that......but THE ROUGH IDEA is that, for 50-51 in quant, i dont think so that u can afford more than 7-8 mistakes.
4195
Guys to get a Score of 50,51 in Verbal, what is maximum number of question we should attempt right from 37

I know its little difficult as its we get marks according to difficult questions we have answered....BUt STILL A ROUGH IDEA may be good

hey atul,

do u mean quant or verbal????coz u get 37 question in quant and 41 in verbal....
well nobody can give u any idea on that......but THE ROUGH IDEA is that, for 50-51 in quant, i dont think so that u can afford more than 7-8 mistakes.
4196

Hello,

Can someone let me know if the answer to the DS Geometry question in the attachment is correct or wrong.

I believe that equating x+y = 2x is wrong as there is no information given to say that angle DAB is equal to x.

Thanks a lot in advance.

4197

2) Together, Mary and Joe have x dollars. If Mary has $80 less than Joe, how much money, in terms of x will Joe have if he receives x dollars?
Choices
A x + 40
B 2x + 40
C 3x/2+ 40
D x/2 + 80
E 3x+8

M+J=x
M = J-80
J-80 + J = x
(J-80)=x-J
J=x-(J-80)

(x-J)+ (x- (J-80)) =x
x-J+x-J+80=x
2x-2J+80=x
2(x-j+40)=x
x-j+40=x/2
x+x/2+40=J
J=3x/2+40!

4198

Exactly.....since there is no information given, it is wrong to assume that DAB is equal to x.

Hello,

Can someone let me know if the answer to the DS Geometry question in the attachment is correct or wrong.

I believe that equating x+y = 2x is wrong as there is no information given to say that angle DAB is equal to x.

Thanks a lot in advance.
4199
2) Together, Mary and Joe have x dollars. If Mary has $80 less than Joe, how much money, in terms of x will Joe have if he receives x dollars?
Choices
A x + 40
B 2x + 40
C 3x/2+ 40
D x/2 + 80
E 3x+8

M+J=x
M = J-80
J-80 + J = x
(J-80)=x-J
J=x-(J-80)

(x-J)+ (x- (J-80)) =x
x-J+x-J+80=x
2x-2J+80=x
2(x-j+40)=x
x-j+40=x/2
x+x/2+40=J
J=3x/2+40!

J+M = X
J-M = 80
Add above eqn, you get
J= X/2 + 40
If J is given X then add X to the above result
J = 3x/2 + 40
4200
sausi007 Says
Exactly.....since there is no information given, it is wrong to assume that DAB is equal to x.


Thank you sausi007.
I found this Q&A; in the The Official Guide for GMAT Quantitative Review 1st Edition.
4201
Hello all,

Can anyone help me out with this problem:-
Please explain the solution.

Regards

If x, y, and k are positive numbers such that (x/x+y)(10) + (y/x+y)(20) = k and if x y, which of the following could be the value of k?
A. 10

B. 12

C. 15

D. 18

E. 30
4202

IMO: D ( I dont know if the explanation or the answer is correct, I am very rusty with QA, still !! )

(10x/x+y)+(20y/x+y) = k
10+ = k (i)

Now since, y>x
2y>x+y
(2y/x+y)>1
(10y/x+y)>5 (ii)

Combining (i) and (ii) we get k>15, that leaves us with options D and E

But, if we take E, we get (10y/x+y)=20
or, (y/x+y)=2, which is not possible since both x and y are +ve.

The explanation looks long, but it actually takes less than a minute.

Kindly confirm with the OA.

Another line of reasoning (which i realised just now !!): And which makes me 100% confident that the answer D is correct.

The equation represents the weighted average of x and y, and since we already know that y>x, the answer should be skewed towards y(i.e. the answer should be more towards 20 rather than 10),
We can rule out 15 since x=y is incorrect, and thus, the answer nearest to 20 is 18 !!!
30 can be ruled out since weighted avg can never be equal to the sum of the two.



Hello all,


Can anyone help me out with this problem:-
Please explain the solution.

Regards

If x, y, and k are positive numbers such that (x/x+y)(10) + (y/x+y)(20) = k and if x y, which of the following could be the value of k?
A. 10

B. 12

C. 15

D. 18

E. 30
4203

@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 10pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } 1. A company has 2 types of machines, type R and type S operating @ constant rate, a machine of type R does a certain job in 36 hours and a machine of type S does the same job in 18 hours. If the company used the same number of each type of machine to do the job in 2 hours, how many machines of type R are used?
3
4
6
9
12

2. If the speed of X meters [er second equivalent to the speed of Y kilometre per hour, what is Y in Terms of X?
5x/18
6X/5
18X/5
60X
3600000X

3. The sequence a1, a2,a3..aN..Of n integers is such that aK=K if K is Odd and aK=-Ak-1 if Ken, Is the sum of terms in the sequence positive?
A> N is ODD
B> an is positive

4204

Yeah...Thats the right answer and explaination is very helpful as I was not able to derive method for this kinda question.

Thanks a lot

4205

hi puys,

Please suggest me some good book for GMAT math section.( The main bottleneck in my math prep is probability. )