GMAT Data Sufficiency Discussions

MBA GMAT
1541
Q. When a cookie is taken at random from a jar, what is the probability that it is chocolate flavored?

  1. There are twice as many chocolate flavored cookies as there are almond flavored cookies in the jar.
  2. One third of the cookies in the jar are almond flavored.



I go with E, as it is nowhere mentioned that there are only two types of cookies.

Whats the OA annyway??
1542

Siddhartha,

If one third of cookies are almond(from stmnt 2) and twice as many are choco(from stmnt 1), there is no scope of any other cookies.

Correct me if I am wrong.

I go with E, as it is nowhere mentioned that there are only two types of cookies.

Whats the OA annyway??
1543

Well the answer must be option C.. and BizzareNym has explianed it perfectly I guess.. ;)

Q. When a cookie is taken at random from a jar, what is the probability that it is chocolate flavored?

  1. There are twice as many chocolate flavored cookies as there are almond flavored cookies in the jar.
  2. One third of the cookies in the jar are almond flavored.

I would pick C.

Looking at options:
1. we dont know if there are other flavors also in the jar . Insuff.
2. Same as A. Only the ratio of almont cookies does nt give any info about choco ones. Insuff

Considering both together: This clarifies that we have only almond and choco cookies in the jar.

So if almond cookies are x, choco are 2x.
probability of picking a coco is : 2x/3x= 2/3
1544
i dont remember the exact wording, but it goes someting like this...
Two persons are selected froma grp of members. What is the probability that the members selected are executive.
a. The no. of total member is 462
b. The ratio of executive members to non executive members in 2:9
1. only a is sufficient
2. Only b is sufficient
3. both a & b are sufficient
4. Either a or B is sufficient
5. Both are NOT suffcient
1545
i dont remember the exact wording, but it goes someting like this...
A person is selected froma grp of members. What is the porpbability that the member selected is executive.
a. The no. of total member is 462
b. The ratio of executive members to non executive members in 2:9

1. only a is sufficient
2. Only b is sufficient
3. both a & b are sufficient
4. Either a or B is sufficient
5. Both are NOT suffcient


Common sense says ,
but my GMAT instincts say that it is - Reason: Nothing to show that there are only 2 categories of people lets say there are 20 support staff among them.
1546

edited the earlier post.. to 2 members need to be selected..

1547

It has to be "c" coz you would need the number of members in the room and also the ratio of executives to normal members.

1548
arunavaray Says
It has to be "c" coz you would need the number of members in the room and also the ratio of executives to normal members.


Puys,

Plz elaborate.
1549
i dont remember the exact wording, but it goes someting like this...
Two persons are selected froma grp of members. What is the probability that the members selected are executive.
a. The no. of total member is 462
b. The ratio of executive members to non executive members in 2:9
1. only a is sufficient
2. Only b is sufficient
3. both a & b are sufficient
4. Either a or B is sufficient
5. Both are NOT suffcient


I did PS section in OG and came across a similar question.
The options given were
A-ratio of boys to girls some x:y
B-total no. of girls some z

The answer was A, given in OG.

Here in this question also P(e) can be given as 2/11 by looking at the first option.No need of total no. of members.

but my GMAT instincts say that it is - Reason: Nothing to show that there are only 2 categories of people lets say there are 20 support staff among them.

Also we need not to add our own premise-that there will be other categories present etc.
1550
I did PS section in OG and came across a similar question.
The options given were
A-ratio of boys to girls some x:y
B-total no. of girls some z

The answer was A, given in OG.

Here in this question also P(e) can be given as 2/11 by looking at the first option.No need of total no. of members.


Also we need not to add our own premise-that there will be other categories present etc.


2/11 is correct... B only is sufficient.
1551
Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?
(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angle BCD.

my answer does not match the OA.. wanted to confirm with my fellow Puys about their thoughts..
1552
Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?


(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angle BCD.
Ans: Edited :biggrin:
1553
Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?
(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angle BCD.

my answer does not match the OA.. wanted to confirm with my fellow Puys about their thoughts..


Varun - As usual, a fantastic question.

IMO: Option E Both 1 and 2 are not Suff

1. 2 interior angles at 90, so sum of the other two is 180 as A+B+C+D = 360.
Sum being 180, one possibility is to have one of the angles at 60, but there are other options. So NOT SUFF

2. Angle B = 2* Angle C so, A+2C+C+D = 360. By itself this takes us no where. So, NOT SUFF

1 & 2 Together: If A and D (lets say) are the angles = 90, then we can have 3C = 180, so C=60.
But this is only one scenario.
We can also have 90,90,45,135. That suffices both the conditions of 1 and 2. two interior angles at 90 each, and one angle is twice the other (B=2C).

So Together, NOT SUFF.
Answer is E.
1554

Should be C.


Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?
(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angle BCD.

my answer does not match the OA.. wanted to confirm with my fellow Puys about their thoughts..
1555

Vikram is right. Ans should be E.I realize my mistake. Tricky question!

BizzareNym Says
Should be C.
1556
Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?

(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angle BCD.
Edited : Vikram :thumbsup: got to know where i went wrong, thanks mate :)
P.S : * @neel throws two bananas, three papayas, mallika sher**** on Vikram
P.S.S : Vikram d0nt reveal it :secret:
P.S.S.S : i did this out of happiness, insanity raaks :biggrin:
P.S.S.S.S: Just to include fun @ work :|, this ain't spam!!
P.S.S.S.S.S : what a colorful post , !!!
1557
Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?



(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angle BCD.
Ans: C :biggrin:

u r right partially ... but just check that 90,90,45,135 combo mate 45*2 !=135 :biggrin:

the combo can be 90,90,60,120 :|



@nee!,
Thats the tricky part. Option 2 does not identify which angles, neither does option 1.
When we have 90,90,45,135........ 45 *2 = 90, its not mentioned in either options that angles ABC and BCD are the non-right angles !!
1558

I thought the same way as you did Vikram2010.. but the OA happens to be option C

I would have easily assumed that the OA is incorrect, but this is from PowerPrep.. so only a little confused ;)

Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?

(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angle BCD.
my answer does not match the OA.. wanted to confirm with my fellow Puys about their thoughts..

@nee!,
Thats the tricky part. Option 2 does not identify which angles, neither does option 1.
When we have 90,90,45,135........ 45 *2 = 90, its not mentioned in either options that angles ABC and BCD are the non-right angles !!
1559
I thought the same way as you did Vikram2010.. but the OA happens to be option C

I would have easily assumed that the OA is incorrect, but this is from PowerPrep.. so only a little confused ;)


NO WAY ! U serious ??
:)

Vikram can go wrong. But Vikram, Varun, @nee! and BizzareNym - All agree and are convinced of one answer, and that being wrong - Cant be. :nono:

Surely seems like a Test writer goof up ! 😃
1560

goof up.. you bet..

this is for the person who drafter & verified the ques/ans :splat::splat::splat:

NO WAY ! U serious ??
:)

Vikram can go wrong. But Vikram, Varun, @nee! and BizzareNym - All agree and are convinced of one answer, and that being wrong - Cant be. :nono:

Surely seems like a Test writer goof up ! :)