NEW HERE? LEARN MORE
closeclose
Last visit was: 28 Apr 2024, 17:05 It is currently 28 Apr 2024, 17:05
Decision Tracker
My Rewards
New posts
New comers' posts

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

If the temperature readings at noon for three consecutive days are +9°

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92977
Own Kudos [?]: 619715 [1]
Given Kudos: 81613
Send PM
CAT Tests Forum Quiz Mode
If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   13 Oct 2017, 00:25
1
Kudos
Expert Reply
00:00
A
B
C
D
E

Difficulty:

5% (low)

Question Stats:

91% (00:50) correct 9% (01:25) wrong based on 55 sessions
Hide Show timer Statistics
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
Intern
Intern
Joined: 18 Jul 2017
Posts: 6
Own Kudos [?]: 3 [1]
Given Kudos: 0
Send PM
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   13 Oct 2017, 00:28
1
Kudos
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
Intern
Intern
Joined: 18 Jul 2017
Posts: 6
Own Kudos [?]: 3 [1]
Given Kudos: 0
Send PM
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   13 Oct 2017, 00:29
1
Kudos
bandanah wrote:
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 wrote:
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
P
varun4s
Senior Manager
Senior Manager
Joined: 07 Jul 2012
Posts: 281
Own Kudos [?]: 324 [2]
Given Kudos: 71
Location: India
Concentration: Finance, Accounting
GPA: 3.5
Send PM
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   13 Oct 2017, 00:36
2
Kudos
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
B
raki99
Intern
Intern
Joined: 11 Apr 2017
Posts: 37
Own Kudos [?]: 14 [1]
Given Kudos: 201
Schools: Kelley '20
Send PM
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   13 Oct 2017, 01:32
1
Kudos
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
P
sahilvijay
Senior Manager
Senior Manager
Joined: 29 Jun 2017
Posts: 312
Own Kudos [?]: 799 [1]
Given Kudos: 76
GPA: 4
WE:Engineering (Transportation)
Send PM
GMAT ToolKit User Reviews Badge
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   13 Oct 2017, 06:20
1
Kudos
Bunuel wrote:
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
P
JeffTargetTestPrep
Target Test Prep Representative
Joined: 04 Mar 2011
Status:Head GMAT Instructor
Affiliations: Target Test Prep
Posts: 3043
Own Kudos [?]: 6286 [1]
Given Kudos: 1646
Send PM
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   27 Nov 2017, 19:12
1
Kudos
Expert Reply
Bunuel wrote:
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
Non-Human User
Joined: 09 Sep 2013
Posts: 32724
Own Kudos [?]: 822 [0]
Given Kudos: 0
Send PM
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink] New post   17 Mar 2020, 00:19
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.
GMAT Club Bot
gmatclubot
Re: If the temperature readings at noon for three consecutive days are +9° [#permalink]
17 Mar 2020, 00:19
Moderators:
Bunuel
Math Expert
92977 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions