average of m + 4 and n â€“ 2

BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

This topic has expert replies

Post new topic Post Reply

Previous Topic Next Topic

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 am; Location: India; Thanked: 267 times; Followed by:80 members; GMAT Score:760

average of m + 4 and n â€“ 2

by sanju09 » Wed Sep 15, 2010 9:20 pm

If the average (arithmetic mean) of 3, 6, 10, m and n is 9, then what is the average of m + 4 and n - 2?
(A) 9
(B) 13
(C) 14
(D) 18
(E) 26

[spoiler]Source: https://readyforgmat.com[/spoiler]

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

Quote

Source: Beat The GMAT — Problem Solving | Wed Sep 15, 2010 9:20 pm

selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 am; Thanked: 135 times; Followed by:7 members

by selango » Wed Sep 15, 2010 9:27 pm

m+n+19=45

m+4+n-2+17=45

m+4+n-2=28

(m+4+n-2)/2=28/2=14

Pick C

--Anand--

Quote

GMAT/MBA Expert

Scott@TargetTestPrep: GMAT Instructor; Posts: 8086; Joined: Sat Apr 25, 2015 10:56 am; Location: Los Angeles, CA; Thanked: 43 times; Followed by:29 members

by Scott@TargetTestPrep » Sat Jan 20, 2018 6:11 am

sanju09 wrote:If the average (arithmetic mean) of 3, 6, 10, m and n is 9, then what is the average of m + 4 and n - 2?
(A) 9
(B) 13
(C) 14
(D) 18
(E) 26

We can use the formula for the arithmetic mean to create the equation:

(3 + 6 + 10 + m + n)/5 = 9

19 + m + n = 45

m + n = 26

We need to determine the average of m + 4 and n - 2; thus:

(m + 4 + n - 2)/2 = (m + n + 4 - 2)/2 = (26 + 4 - 2)/2 = 28/2 = 14

Answer: C

Scott Woodbury-Stewart
Founder and CEO
[email protected]