Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

After 3 months' studying, taking the GMAT in 2 days... if [#permalink]

Show Tags

05 Jun 2006, 17:48

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

After 3 months' studying, taking the GMAT in 2 days... if someone could help me understand these 2 DS problems, I would greatly appreciate it:

#1:

If a<y<z<b, is ly-al < ly-bl? (those are absolute value signs... not "L"s:))

(1) ly-al < lz-bl
(2) ly-al < lz-bl

Answer is D, but I don't have a clue how to approach. One thing that I find particularly confusing is that within each absolute value sign, you could have a positive or negative value and there are way too many absolute value numbers floating around for me to know what to do...

#2

A manufacturer produced x percent more video cameras in 1994 than 1993 and y percent more video cameras in 1995 than in 1994. If the manufacturer produced 1000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995?

(1) xy = 20
(2) x + y + (xy/100) = 9.2

Answer is B, but I don't know how to do this one either. Many thanks in advance.

Re: GMAT in 2 Days... 2 Hard GMATPrep Questions... [#permalink]

Show Tags

05 Jun 2006, 18:18

lackeym77 wrote:

After 3 months' studying, taking the GMAT in 2 days... if someone could help me understand these 2 DS problems, I would greatly appreciate it:

#1:

If a<y<z<b, is ly-al < ly-bl? (those are absolute value signs... not "L"s:))

(1) ly-al < lz-bl (2) ly-al < lz-bl

Marcus

Please post the correct question. Both 1 and 2 are same.

-------a-----y-----z-----b-------
Is |y-a| < |y-b| ? => Is the distance between y and a less than the distance between y and b?
From 1. ly-al < lz-bl => distance between y and a is less than distance between z and b.
Since distance between y and b is greater than distance between z and b. it should be true that |y-a| < |y-b|. Hence sufficient.
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

Re: GMAT in 2 Days... 2 Hard GMATPrep Questions... [#permalink]

Show Tags

05 Jun 2006, 18:22

lackeym77 wrote:

#2

A manufacturer produced x percent more video cameras in 1994 than 1993 and y percent more video cameras in 1995 than in 1994. If the manufacturer produced 1000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995?

(1) xy = 20 (2) x + y + (xy/100) = 9.2

Answer is B, but I don't know how to do this one either. Many thanks in advance.

Marcus

Here is the answer to #2:
In 1994 the price for the Camera will be = 1000(1+ x/100)
= 1000 + 10x

In 1995 the price for the Camera will be = (1000+ 10x)(1+y/100)
1000+ 10x+ 10y + xy/10 (A)

i) As only value of xy is given and not the value of x & y, therefore (i) is insufficient.

ii) x + y+ xy/100 = 9.2
(A)=>price in 1995 = 1000 +10(x + y+ xy/100)
= 1000 + 10*9.2
= 1092
Therefore (ii) is sufficient
Hence B.

Re: GMAT in 2 Days... 2 Hard GMATPrep Questions... [#permalink]

Show Tags

05 Jun 2006, 18:24

lackeym77 wrote:

#2

A manufacturer produced x percent more video cameras in 1994 than 1993 and y percent more video cameras in 1995 than in 1994. If the manufacturer produced 1000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995?

(1) xy = 20 (2) x + y + (xy/100) = 9.2

Answer is B, but I don't know how to do this one either. Many thanks in advance.

Marcus

Let P (= 1000) be the value in 1993, then in
1994: it is P*(1+x/100)
1995: it is P*(1+x/100)*(1+y/100) = P*(1+x/100+y/100+xy/(100*100))
= P/100(1+x+y+xy/100) --> This is provided in B.
= 1000+ 1000*9.2/100 = 1092 SUFF.

1. Is not sufficient since we don't know the individual values of x and y.
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

Re: GMAT in 2 Days... 2 Hard GMATPrep Questions... [#permalink]

Show Tags

09 Jun 2006, 01:23

lackeym77 wrote:

#2

A manufacturer produced x percent more video cameras in 1994 than 1993 and y percent more video cameras in 1995 than in 1994. If the manufacturer produced 1000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995?