Target Test Prep 20% Off Flash Sale is on! Code: FLASH20

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

ALGEBRA

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 8
Joined: Sun Feb 17, 2013 1:46 am

ALGEBRA

by candela.tartiere » Tue Feb 26, 2013 3:08 am
if k and m are numbers such that k + m = 20 and k^2 + m^2 = 289, then the value of the product km is?
A. between 20 and 60
B. between 60 and 100
C. between 100 and 150
D. between 150 and 200
E. greater than 200
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Tue Feb 26, 2013 3:14 am
candela.tartiere wrote:if k and m are numbers such that k + m = 20 and k^2 + m^2 = 289, then the value of the product km is?
(k + m)² = k² + m² + 2km

Hence, km = [(k + m)² - (k² + m²)]/2 = [20² - 289]/2 = [400 - 289]/2 = 111/2 = 55.5

The correct answer is A.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Post new topic Post Reply
• Page 1 of 1