GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 19 Aug 2018, 21:39

### 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

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

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

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 48037
If the temperature readings at noon for three consecutive days are +9°  [#permalink]

### Show Tags

13 Oct 2017, 00:25
1
00:00

Difficulty:

15% (low)

Question Stats:

86% (00:42) correct 14% (00:55) wrong based on 42 sessions

### HideShow 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°

_________________
Intern
Joined: 18 Jul 2017
Posts: 6
Re: If the temperature readings at noon for three consecutive days are +9°  [#permalink]

### Show Tags

13 Oct 2017, 00:28
1
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
Intern
Joined: 18 Jul 2017
Posts: 6
Re: If the temperature readings at noon for three consecutive days are +9°  [#permalink]

### Show Tags

13 Oct 2017, 00:29
1
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
Senior Manager
Joined: 07 Jul 2012
Posts: 355
Location: India
Concentration: Finance, Accounting
GPA: 3.5
Re: If the temperature readings at noon for three consecutive days are +9°  [#permalink]

### Show Tags

13 Oct 2017, 00:36
1
Let the temperature of the 4th day be: x

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

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

Kudos please if you like my explanation!
_________________

Kindly hit kudos if my post helps!

Intern
Joined: 11 Apr 2017
Posts: 38
Schools: Kelley '20
Re: If the temperature readings at noon for three consecutive days are +9°  [#permalink]

### Show Tags

13 Oct 2017, 01:32
1
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

Senior Manager
Joined: 29 Jun 2017
Posts: 493
GPA: 4
WE: Engineering (Transportation)
Re: If the temperature readings at noon for three consecutive days are +9°  [#permalink]

### Show Tags

13 Oct 2017, 06:20
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 )

_________________

Give Kudos for correct answer and/or if you like the solution.

Target Test Prep Representative
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2759
Re: If the temperature readings at noon for three consecutive days are +9°  [#permalink]

### Show Tags

27 Nov 2017, 19:12
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

_________________

Jeffery Miller

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Re: If the temperature readings at noon for three consecutive days are +9° &nbs [#permalink] 27 Nov 2017, 19:12
Display posts from previous: Sort by

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.