GMAT Data Sufficiency Discussions

hi,

yes u r right.

yes , can i talk about physics here

this is a good one. please provide your explanation and theory.

A rectangle has its perimeter and diagonal integers. Is the breadth of rectangle an integer?

(1) Area of the rectangle is an integer.

(2) Perimeter of the rectangle is 2 more than its area.

this is a good one. please provide your explanation and theory.

A rectangle has its perimeter and diagonal integers. Is the breadth of rectangle an integer?

(1) Area of the rectangle is an integer.

(2) Perimeter of the rectangle is 2 more than its area.


is it D.....
kapur.arnav Says
is it D.....


can u provide ur explanation plz?

Hi
I hope it's ok to post this here. I'm new to gmat and weak in all aspects. I couldn't find any books on GMAT in the place I'm living now. So, i searched around and found this site on last digit and cyclicity. I hope other people who have the same problem as I do will find it useful as well:
Last Digit Analysis and Cyclicity

Mod, feel free to move this post to a more appropriate forum

MissionPGPX Says
can u provide ur explanation plz?


Just substituted various values for the length and breadth... Hence, both were satisfying... so D... wats the OA?
kapur.arnav Says
Just substituted various values for the length and breadth... Hence, both were satisfying... so D... wats the OA?


OA is D. but bit confusing explanation for me.

if mn # 0, what is the ratio of m to n^2?
1) the ratio of m^2 to 1 is 7/5.
2) The ratio of m to n^2 is 7/5.
PS: # means 'not equal to'

At a certain university, if 50 percent of the people who inquire about admission policies actually submit applications for admission, what percent of those who submit applications for admission enroll in classes at the university?
(1) Fifteen percent of those who submit applications for admission are accepted at the university.
(2) Eighty percent of those who are accepted send a deposit to the university.

please explain why the OA is E??
At a certain university, if 50 percent of the people who inquire about admission policies actually submit applications for admission, what percent of those who submit applications for admission enroll in classes at the university?
(1) Fifteen percent of those who submit applications for admission are accepted at the university.
(2) Eighty percent of those who are accepted send a deposit to the university.

please explain why the OA is E??


Lets assume the follow figs

Eqnry = 300
submit = 150
Accpeted = 23 approx
Send a Deposit = 19 approx

I will go with option C bcos with both the statements.Assumption is Send a deposit = enrollment in class though,nt sure.
if mn # 0, what is the ratio of m to n^2?
1) the ratio of m^2 to 1 is 7/5.
2) The ratio of m to n^2 is 7/5.
PS: # means 'not equal to'


statement 1 doesn't talk about n.So insuff

Statement 2 gives the ans for our q.

So I will go with option B

Tom places a deck of 52 playing cards face down and then picks them up one by one.does he find a pair of consecutive red cards ?

a) Every fourth card that he picks is black.
b) Every fifth card that he picks is a spade.

Pl. explain the solution.

Tom places a deck of 52 playing cards face down and then picks them up one by one.does he find a pair of consecutive red cards ?

a) Every fourth card that he picks is black.
b) Every fifth card that he picks is a spade.

Pl. explain the solution.


generally i find this cards tough to tackle but this one i think i got.

S1: not sufficient every fourth card is black means any of first 3 cards could be red and may or maynot be consequetive red.

S2: Not sufficient. every 5th is spade means remaining could be any order of other 3 types.

combining them together means 4th is black and 5th is spade. only two cards remain hearts and diamonds both are red. it has to be consequetive.

answer is C.

I will also go with option C.Explanation is given by "MissionPGPX"

generally i find this cards tough to tackle but this one i think i got.

S1: not sufficient every fourth card is black means any of first 3 cards could be red and may or maynot be consequetive red.

S2: Not sufficient. every 5th is spade means remaining could be any order of other 3 types.

combining them together means 4th is black and 5th is spade. only two cards remain hearts and diamonds both are red. it has to be consequetive.

answer is C.



ANSWER is B

lets solve some GMATprep questions:

a)if m and r are the two numbers on number line, what is the value of r?
1)the distance between r and 0 is 3 times the distance between m and 0.
2) 12 is halfway between m and r.

b)Is x^4+y^4 >z^4 ?
1) x^2+y^2 >z^2
2) x+y > z

Tom places a deck of 52 playing cards face down and then picks them up one by one.does he find a pair of consecutive red cards ?

a) Every fourth card that he picks is black.
b) Every fifth card that he picks is a spade.

Pl. explain the solution.

Hi,

the 2nd statement is enough to answer the question, so I think the answer should be B.

Explanation:
If we look at the scenario, and assume worst case, it looks like
RBRBB RBRBB RBRBB ... so in a group of every 5, there will be 3 B and 2 R.
Hence, the B will be exhausted in less than 9 groups and R will still be there. So certainly, two Rs will occur together. I hope it makes sense ! πŸ˜ƒ
lets solve some GMATprep questions:

a)if m and r are the two numbers on number line, what is the value of r?
1)the distance between r and 0 is 3 times the distance between m and 0.
2) 12 is halfway between m and r.

b)Is x^4+y^4 >z^4 ?
1) x^2+y^2 >z^2
2) x+y > z

A) Both the statements are not enough to answer the question.
Explanation- There are two possible scenarios : m-0-12-r OR 0-m-12-r ... so we cannot be sure of r
lets solve some GMATprep questions:

a)if m and r are the two numbers on number line, what is the value of r?
1)the distance between r and 0 is 3 times the distance between m and 0.
2) 12 is halfway between m and r.


Individual statements are not sufficient to answer the q.Even combining also we get m=6 & r=18 or m=-12 , r = 36

I will go with option E
lets solve some GMATprep questions:

b)Is x^4+y^4 >z^4 ?
1) x^2+y^2 >z^2
2) x+y > z


Statement 1 is suff to answer the q.

statement 2 is insuff to ans: x=2 , y=-2 ,z=-5 or x=-4 y = 4 z = -1

So I will go with option A