GMAT Problem Solving Discussions

[nairpraveenk]

This thread is for all those junta who will be appearing for GMAT.....

We dont have a proper GMAT discussion thread. Here I will post post GMAT related problems and discuss them.

Hope to see lots of participants

[nairpraveenk]

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.

[nairpraveenk]

A jar contains 30 marbles, of which 20 are red and 10 are blue. If 9 of the marbles are removed, how many of the marbles left in the jar are red?

(1) Of the marbles removed, the ratio of the number of red ones to the number of blue ones is 2 : 1.
(2) Of the first 6 marbles removed, 4 are red.

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.

[nairpraveenk]

Last Friday a certain shop sold 3/4 of the sweaters in its inventory. Each sweater sold or $20. What was the total revenue last Friday from the sale of these sweaters?

(1) When the shop opened last Friday, there were 160 sweaters in its inventory.
(2) All but 40 sweaters in the shop’s inventory were sold last Friday.

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.

[nairpraveenk]

While on a straight road, car

X and car Y are traveling at different constant rates. If car X is now 1 mile ahead of car Y, how many minutes from now

will car X be 2 miles ahead of car Y ?

(1) Car X is traveling at 50 miles per hour and car Y is traveling at 40 miles per hour.

(2) 3 minutes ago car X was 1/2 mile ahead of car Y.

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.

[nairpraveenk]

In a certain office, 50 percent of the employees are college graduates and 60 percent of the employees are over 40 years old. If 30 percent of those over 40 have master’s degrees, how many of the employees over forty have master’s degrees?

(1) Exactly 100 of the employees are college graduates.

(2) Of the employees forty years old or less, 25 percent have master’s degrees.

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.

[nairpraveenk]

What is the number of female employees in Company

X ?

(1) If Company

X were to hire 14 more people and all of these people were females, the ratio of the number of male employees to the number of female employees would then be 16 to 9.

(2) Company

X has 105 more male employees than female employees.

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.

[nairpraveenk]

Originally Posted by nairpraveenk

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.

Answers....

Option E) Cannot be answered using both.

Analysis!!:
A----------B---------C----------D
Is

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

Here goes..
1) If AD = 20, we can conclude nothing except for its total length.
2) AB = CD, using this we can form an equation:
AB + BC + CD = Total Length
Let AB = CD = x
2x + BC = Total lenght

Cant conclude anythign.

Using Both!!
2x + BC = 20
BC = 20 - 2x

Put x =5; bc = 10; CD < BC
Put x = 7; bc = 6 BC < CD

Thus enough info is not available.
Thus option E.

[Baby]

Hi

You can post all the questions in a single post rather than using multiple posts. And please wait for the junta to solve it. What's the point in giving out the questions and solutions at the same time. You could, say, post five questions...provide a deadline...and then give out teh solutions

Mridul

[mucool]

Originally Posted by nairpraveenk

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.

shud be E....both are insufficient and in combination also they tell u nothing....
ab=cd=5 bc=10 cd<bc no
ab=cd=8 bc=4 cd>bc yes

no specific answer.