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.
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: If a, b, c, and d are consecutive integers and a < b < c < d, what is
[#permalink]
Show Tags
22 Jan 2018, 08:36
Bunuel wrote:
If a, b, c, and d are consecutive integers and a < b < c < d, what is the average (arithmetic mean) of a, b, c, and d in terms of d?
(A) d – 5/2
(B) d – 2
(C) d – 3/2
(D) d + 3/2
(E) (4d – 6)/7
As the numbers are consecutive, let the numbers be c-2, c-1,c , c+1 A.M = (4c-2)/4 = c -(1/2).. Also, as d = c+1 from above equation, c = d - 1 So, AM = d -(3/2)
_________________
If my Post helps you in Gaining Knowledge, Help me with KUDOS.. !!
Re: If a, b, c, and d are consecutive integers and a < b < c < d, what is
[#permalink]
Show Tags
22 Jan 2018, 23:29
1. Av= \(\frac{(A+D)}{2}\) (as it is consecutive evenly spaced numbers) 2. Range = D-A=3 (as it is consecutive numbers with increment of 1) 3. Substitute A= D-3 in 1. Av=\(\frac{(D-3+D)}{2}\) ->Av=\(\frac{(2D-3)}{2}\) 4. After dividing by 2 it becomes Av=D-\(\frac{3}{2}\). Answer (C)
_________________
close
80% (01:28) correct 
Non-Allergic To Kudos 
