Last visit was: 11 Dec 2024, 15:41 It is currently 11 Dec 2024, 15:41
Home
GMAT
Messages
Tests
Schools
Reviews
Social
Chat
My Profile
Close
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

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 11 Dec 2024
Posts: 97,815
Own Kudos:
685,144
 [1]
Given Kudos: 88,242
Products:
GMAT Club Tests Forum Quiz
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 97,815
Kudos: 685,144
 [1]
If the temperature readings at noon for three consecutive days are +9° 13 Oct 2017, 00:25
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

92% (00:48) correct 8% (01:25) wrong based on 59 sessions

History

Date
Time
Result
Not Attempted Yet
If the temperature readings at noon for three consecutive days are +9°,—6°, and +8°, what must the reading be at noon on the fourth day for the average (arithmetic mean) noon temperature of all four days to be +4°?

A. –11°
B. –7°
C. +2°
D. +4°
E. +5°
ShowHide Answer
Official Answer
E
avatar
bandanah
avatar
Joined: 18 Jul 2017
Last visit: 13 Jul 2018
Posts: 6
Own Kudos:
3
 [1]
Posts: 6
Kudos: 3
 [1]
If the temperature readings at noon for three consecutive days are +9° 13 Oct 2017, 00:28
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
D) +5degree... solution:- +9-6+8+4/4...The result is +4 degree which is the average (arithmetic mean)

Sent from my Redmi 4 using GMAT Club Forum mobile app
avatar
bandanah
avatar
Joined: 18 Jul 2017
Last visit: 13 Jul 2018
Posts: 6
Own Kudos:
3
 [1]
Posts: 6
Kudos: 3
 [1]
If the temperature readings at noon for three consecutive days are +9° 13 Oct 2017, 00:29
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
bandanah
D) +5degree... solution:- +9-6+8+4/4...The result is +4 degree which is the average (arithmetic mean)

Sent from my Redmi 4 using GMAT Club Forum mobile app
9-6+8+5/4...it's +5 and not +4.

Bunuel
If the temperature readings at noon for three consecutive days are +9°,—6°, and +8°, what must the reading be at noon on the fourth day for the average (arithmetic mean) noon temperature of all four days to be +4°?

A. –11°
B. –7°
C. +2°
D. +4°
E. +5°


Sent from my Redmi 4 using GMAT Club Forum mobile app
User avatar
varun4s
User avatar
Joined: 07 Jul 2012
Last visit: 11 Mar 2022
Posts: 281
Own Kudos:
327
 [2]
Given Kudos: 71
Location: India
Concentration: Finance, Accounting
GPA: 3.5
Posts: 281
Kudos: 327
 [2]
If the temperature readings at noon for three consecutive days are +9° 13 Oct 2017, 00:36
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Let the temperature of the 4th day be: x

\(\frac{+9-6+8+x}{4}\) =4

11+x=16
x= 16-11= +5

Answer: E.

Kudos please if you like my explanation!
User avatar
raki99
User avatar
Joined: 11 Apr 2017
Last visit: 07 Apr 2021
Posts: 37
Own Kudos:
15
 [1]
Given Kudos: 201
Schools: Kelley '20
Schools: Kelley '20
Posts: 37
Kudos: 15
 [1]
If the temperature readings at noon for three consecutive days are +9° 13 Oct 2017, 01:32
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Let the temperature of the 4th day be: x

+9−6+8+x4+9−6+8+x4 =4

11+x=16
x= 16-11= +5

Answer: E.
User avatar
sahilvijay
User avatar
Joined: 29 Jun 2017
Last visit: 16 Apr 2021
Posts: 305
Own Kudos:
846
 [1]
Given Kudos: 76
GPA: 4
WE:Engineering (Transportation)
Products:
My Reviews
Posts: 305
Kudos: 846
 [1]
If the temperature readings at noon for three consecutive days are +9° 13 Oct 2017, 06:20
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
If the temperature readings at noon for three consecutive days are +9°,—6°, and +8°, what must the reading be at noon on the fourth day for the average (arithmetic mean) noon temperature of all four days to be +4°?

A. –11°
B. –7°
C. +2°
D. +4°
E. +5°


best way => you want 4 as average=> compare wrt 4 up or down
9 = u went 5 up
-6 = u went 10 down => 5 down nett
+8 = u went 4 up => 1 down nett
assume 4th one be 4 so if u take 4 => u are still 1 down in nett
to raise by 1 you should have 5 in th place so that when 5 is there 1 up will nullify 1 down

=> 4 is avg when => 5 is the answer

==========================

9 is 5 higher
-6 is 10 lower ( net 5 lower)
8 is 4 higher ( net 1 lower)
5 is 1 higer ( net same )

5 is answer
User avatar
JeffTargetTestPrep
User avatar
Target Test Prep Representative
Joined: 04 Mar 2011
Last visit: 05 Jan 2024
Posts: 3,023
Own Kudos:
7,204
 [1]
Given Kudos: 1,646
Status:Head GMAT Instructor
Affiliations: Target Test Prep
Expert reply
Posts: 3,023
Kudos: 7,204
 [1]
If the temperature readings at noon for three consecutive days are +9° 27 Nov 2017, 19:12
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
If the temperature readings at noon for three consecutive days are +9°,—6°, and +8°, what must the reading be at noon on the fourth day for the average (arithmetic mean) noon temperature of all four days to be +4°?

A. –11°
B. –7°
C. +2°
D. +4°
E. +5°

We can let n = the temperature on the fourth day and use the formula sum/number = average to create the equation:

(9 + (-6) + 8 + n)/4 = 4

11 + n = 16

n = 5

Answer: E
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 35,789
Own Kudos:
929
Posts: 35,789
Kudos: 929
If the temperature readings at noon for three consecutive days are +9° 17 Mar 2020, 00:19
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Moderator:
Bunuel
Math Expert
97815 posts