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.
Jul 0911:00 AM PDT
-12:30 PM PDT
Welcome to the M7 MBA Spotlight Series, featuring MIT Sloan School of Management! This video is part of GMAT Club’s exclusive MBA Spotlight event, where top business schools meet prospective applicants like you.- Jun 30
08:00 AM PDT
-11:59 PM PDT
Join us June 30th for 2 weeks of GMAT questions (just 8 per day) to help with your prep and to compete with your fellow GMAT Clubbers for a chance to win a prize fund of $30,000 for you and your team-mates! - Jul 10
11:00 AM PDT
-11:00 AM PDT
In our conversation, Kishore talks about how strategically he used data analytics to identify high impact areas to focus on as well as his early morning study routine (3 AM prep!) that optimized his GMAT preparation. 
Jul 1211:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.
Jul 1311:00 AM EDT
-12:30 PM EDT
Looking for your GMAT motivation to break through the score plateau? Pragati improved her score by massive 160 points with strategic guidance and hard-work! Find out how personalized mentorship and a strong mindset can turn GMAT struggles into success.
Jul 1508:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations!
06 Apr 2011, 14:21
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
82% (02:26) correct
18%
(02:25)
wrong
based on 2749
sessions
History
Date
Time
Result
Not Attempted Yet
What is the sum of the integers in the table above?
(A) 28
(B) 112
(C) 336
(D) 448
(E) 784
Attachment:
Table.jpg [ 55.21 KiB | Viewed 57255 times ]
06 Apr 2011, 14:26
Kudos
Bookmarks
Baten80
Attachment:
Table.jpg
What is the sum of the integers in the table above?(A) 28
(B) 112
(C) 336
(D) 448
(E) 784
All rows are evenly spaced.
The numbers in 4th column are the averages of respective rows.
Every row has 7 elements.
Thus,
Total = (4-8+12-16+20-24+28)*7 = (64-48)*7= 16*7= 112
Ans: "B"
17 May 2012, 01:43
Kudos
Bookmarks
keiraria
fluke
Baten80
Why will we multiply the sum of column by 7?
Take 1 row at a time
1st row: Total = Average*Number of elements = 4*7
2nd row: Total = Average*Number of elements = -8*7
3rd row: Total = Average*Number of elements = 12*7
4th row: Total = Average*Number of elements = -16*7
5th row: Total = Average*Number of elements = 20*7
6th row: Total = Average*Number of elements = -24*7
7th row: Total = Average*Number of elements = 28*7
Add them up:
4*7+(-8)*7+12*7+(-16)*7+20*7+(-24)*7+28*7
Take 7 common:
7(4-8+12-16+20-24+28)
Hello Fluke
just to make sure I understood
as thoses questions look tricky and time consuming
first each line is a AP Progression
you use the average formula in reverse to find the sum
since in an AP Progression the mean or average is the same as median number
and then you factorise by 7 to complete the sum and multiply it by 7 as each line is a multiple of 7
right ?
Thanks for help
best regards
Each row represents an evenly spaced set (aka arithmetic progression). In any evenly spaced set the arithmetic mean (average) is equal to the median and the sum of the terms in any evenly spaced set is the mean (average) multiplied by the number of terms.
The median of each row is the middle number and each row has 7 numbers in it so the sum of the table is:
\(7*4+7*(-8)+7*12+7*(-16)+7*20+7*(-24)+7*28=7(4-8+12-16+20-24+28)=112\).
Answer: B.
keiraria
subhashghosh
I went for a different approach, the sum of every coulmn came as a multiple of 4, starting from 4, and there are 7 columns.
So sum = 4 + 8 + 12 + 16 + 20 + 24 + 28
= 112
Answer - B
So sum = 4 + 8 + 12 + 16 + 20 + 24 + 28
= 112
Answer - B
hello
why do you have added all the average plz explain
thanks for your help
best regards
Those are not averages, but the sums of the numbers in each column.
