February 23 , 2019
February 23 , 2019
07:00 AM PST
09:00 AM PST
Learn reading strategies that can help even non-voracious reader to master GMAT RC. Saturday, February 23rd at 7 AM PT
February 24 , 2019
February 24 , 2019
07:00 AM PST
09:00 AM PST
Get personalized insights on how to achieve your Target Quant Score.
Author
Message
TAGS:
Math Expert
Joined: 02 Sep 2009
Posts: 53069
If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
Show Tags
29 Aug 2018, 23:32
D
E
Add Notes
Question Stats:
82% (01:09) correct
18% (01:07) wrong
based on 40 sessions
Hide Show timer Statistics
If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is the average of a, b, c, and 13?
(A) 8
(B) 8.5
(C) 9
(D) 9.5
(E) It cannot be determined from the information given.
Official Answer and Stats are available only to registered users.
Register /
Login .
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders ; 8. Overlapping Sets | PDF of Math Book ; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years. Collection of Questions: PS: 1. Tough and Tricky questions ; 2. Hard questions ; 3. Hard questions part 2 ; 4. Standard deviation ; 5. Tough Problem Solving Questions With Solutions ; 6. Probability and Combinations Questions With Solutions ; 7 Tough and tricky exponents and roots questions ; 8 12 Easy Pieces (or not?) ; 9 Bakers' Dozen ; 10 Algebra set. ,11 Mixed Questions , 12 Fresh Meat DS: 1. DS tough questions ; 2. DS tough questions part 2 ; 3. DS tough questions part 3 ; 4. DS Standard deviation ; 5. Inequalities ; 6. 700+ GMAT Data Sufficiency Questions With Explanations ; 7 Tough and tricky exponents and roots questions ; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!! ; 10 Number Properties set. , 11 New DS set. What are GMAT Club Tests ? Extra-hard Quant Tests with Brilliant Analytics
Intern
Joined: 28 Oct 2017
Posts: 32
Location: India
GMAT 1 : 640 Q47 V32
GMAT 2 : 710 Q49 V38
Re: If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
Show Tags
29 Aug 2018, 23:54
a+b+c+5+6=5*6 -> a+b+c = 19 -> a+b+c+13 = 32 -> (a+b+c+13)/ 4 = 32/4 = 8, hence option (A)
Intern
Joined: 26 Dec 2016
Posts: 12
Re: If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
Show Tags
30 Aug 2018, 00:04
very basic question. (a+b+c+5+6)/5=6, so a+b+c=19. (a+b+c+13)/4=(19+13)/4=8 ANS.A
Director
Status: Learning stage
Joined: 01 Oct 2017
Posts: 958
WE: Supply Chain Management (Energy and Utilities)
Re: If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
Show Tags
30 Aug 2018, 00:09
Bunuel wrote:
If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is the average of a, b, c, and 13? (A) 8 (B) 8.5 (C) 9 (D) 9.5 (E) It cannot be determined from the information given.
Given, a+b+c+5+6=5*6=30
Or, a+b+c+5+6+2=30+2=32
Or, \(\frac{a+b+c+13}{4}=\frac{32}{4}=8\)
Or, average of a, b, c, and 13 is 8
Ans. (A)
_________________
Regards, PKN Rise above the storm, you will find the sunshine
VP
Joined: 31 Oct 2013
Posts: 1162
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
Show Tags
30 Aug 2018, 05:14
Bunuel wrote:
If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is the average of a, b, c, and 13? (A) 8 (B) 8.5 (C) 9 (D) 9.5 (E) It cannot be determined from the information given.
\(\frac{a + b + c + d + 5 + 6}{5 = 6}\)
a + b + c + d + 11 = 30
a + b + c = 19
a + b + c + 13 / 4
\(\frac{19 + 13}{4}\)
= \(\frac{32}{4}\)
= 8
The best answer is A.
Board of Directors
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4391
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
Re: If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
Show Tags
30 Aug 2018, 06:12
Bunuel wrote:
If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is the average of a, b, c, and 13? (A) 8 (B) 8.5 (C) 9 (D) 9.5 (E) It cannot be determined from the information given.
\(a + b + c + 5 + 6 = 30\)
So, \(a + b + c = 19\)
So, the average of a, b, c, and 13 = \(\frac{19 + 13}{4} = 8\) Answer must be (A)
_________________
Thanks and Regards Abhishek.... PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )
Target Test Prep Representative
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2827
Re: If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
Show Tags
04 Sep 2018, 03:38
Bunuel wrote:
If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is the average of a, b, c, and 13? (A) 8 (B) 8.5 (C) 9 (D) 9.5 (E) It cannot be determined from the information given.
We can create the equation:
(a + b + c + 5 + 6)/5 = 6
a + b + c + 11 = 30
a + b + c = 19
So the average of a, b, c, and 13 is:
(a + b + c + 13)/4
(19 + 13)/4
32/4 = 8
Answer: A
_________________
Jeffery Miller
Head of GMAT Instruction
GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions
Re: If the average (arithmetic mean) of a, b, c, 5, and 6 is 6, what is th
[#permalink ]
04 Sep 2018, 03:38