Events & Promotions
|
|
GMAT Club Daily Prep
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Nov 2211:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment- Nov 23
11:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease. 
Nov 2510:00 AM EST
-11:00 AM EST
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors.
02 Dec 2019, 00:42
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
72% (01:35) correct
28%
(01:30)
wrong
based on 209
sessions
History
Date
Time
Result
Not Attempted Yet
10, x, 30, y, 50
In the above sequence, x and y are integers, and the numbers are arranged in increasing order. What is the value of y - x ?
(1) The median of the sequence is equal to the mean.
(2) \(\frac{y+x}{2}=30\)
Are You Up For the Challenge: 700 Level Questions
In the above sequence, x and y are integers, and the numbers are arranged in increasing order. What is the value of y - x ?
(1) The median of the sequence is equal to the mean.
(2) \(\frac{y+x}{2}=30\)
Are You Up For the Challenge: 700 Level Questions
02 Dec 2019, 05:44
Kudos
Bookmarks
The answer is A.
As we have a couple of known terms, so we can easily deduct "d" - difference of arithmetic progression:
a3= a1 + 2d = 10 + 2d = 30
a5=a1 + 4d = 10 + 4d = 50
d=10.
So x(a2)=a1+d=10+10=20; y(a4)=a1+3d=10+30=40
y-x=40-20=20.
Sufficient.
(2) (y+x)/2=30
From this statement we only know that x+y = 60. There are can be more than one pair of x and y that satisfies the statetment:
x=11 and y = 49 > y-x=38
x=12 and y=48 > y-x=36
Not sufficient.
Quote:
The fact that med = mean implies that we have an arithmetic progression.
As we have a couple of known terms, so we can easily deduct "d" - difference of arithmetic progression:
a3= a1 + 2d = 10 + 2d = 30
a5=a1 + 4d = 10 + 4d = 50
d=10.
So x(a2)=a1+d=10+10=20; y(a4)=a1+3d=10+30=40
y-x=40-20=20.
Sufficient.
(2) (y+x)/2=30
From this statement we only know that x+y = 60. There are can be more than one pair of x and y that satisfies the statetment:
x=11 and y = 49 > y-x=38
x=12 and y=48 > y-x=36
Not sufficient.
General Discussion
02 Dec 2019, 02:32
Kudos
Bookmarks
Clearly E ;
as both 1 &2 give same info
as both 1 &2 give same info
Bunuel
