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:

Re: What is the value of the expression above? [#permalink]

Show Tags

19 Oct 2010, 11:19

A

I SUFF - > 4n - (x+y+z+k) = Q n - (x+y+z+k)/4 = Q/4 n - n = Q => 0

II INSUFF - > Even though we could say y = x+1, z = x+2 so forth; making the expression 4 n - (4x+6). But we do not know what is n or x
_________________

Re: What is the value of the expression above? [#permalink]

Show Tags

20 Oct 2010, 07:08

A.

4n-(x+y+z+k)

1. (x+y+z+k)/4=n ----> (x+y+z+k)=4n -----> 4n-4n=0 (Sufficient) 2. the statement doesn't give us any relationship between x,y,z&k and n. (Insufficient)

Even if 2. gave us some kind of relationship between one of these variables and n you will end up with multiple values.

n, n+1, n+2, n+3 --------> 4n-(4n+6)=-6 n-1, n, n+1, n+2 --------> 4n-(4n+2)=-2
_________________

Consider KUDOS if my post was helpful.

My Debrief: http://gmatclub.com/forum/750-q49v42-105591.html#p825487

(n-x) + (n-y) + (n-c) + (n-k) What is the value of the expression above?

(1) The average (arithmetic mean) of x, y, c, and k is n. (2) x, y, c, and k are consecutive integers.

We need to determine the value of (n-x) + (n-y) + (n-c) + (n-k), which can be simplified to:

4n - x - y - c - k

Statement One Alone:

The average (arithmetic mean) of x, y, c, and k is n.

We can create the following equation:

(x + y + c + k)/4 = n

x + y + c + k = 4n

Notice that 4n - x - y - c - k = 4n - (x + y + c + k), so we can substitute x + y + c + k with 4n and we have:

4n - (x + y + c + k) = 4n - 4n = 0

Statement one alone is sufficient to answer the question.

Statement Two Alone:

x, y, c, and k are consecutive integers.

Knowing that x, y, c, and k are consecutive integers is not enough information to determine the value of (n-x) + (n-y) + (n-c) + (n-k) because we still don’t know each individual value of x, y, c, and k, nor do we know anything about n. Statement two alone is not sufficient to answer the question.

Answer: A
_________________

Jeffery Miller Head of GMAT Instruction

GMAT Quant Self-Study Course 500+ lessons 3000+ practice problems 800+ HD solutions

There’s something in Pacific North West that you cannot find anywhere else. The atmosphere and scenic nature are next to none, with mountains on one side and ocean on...

This month I got selected by Stanford GSB to be included in “Best & Brightest, Class of 2017” by Poets & Quants. Besides feeling honored for being part of...

Joe Navarro is an ex FBI agent who was a founding member of the FBI’s Behavioural Analysis Program. He was a body language expert who he used his ability to successfully...